Weight Distribution Hitch: Do I Need One?
US & CanadaYour receiver label already answers it. Enter its two ratings and your trailer, and see whether you need one, what bars to buy and where to set them.
Do I need a weight distribution hitch?
Result
0
Your setup, against its ratings
Every limit here comes from your own label and manual. The bar sizing and restoration figures are hitch and vehicle maker guidance, not law.
Do I need a weight distribution hitch?
You need one when any of three things is true: the loaded trailer is over the receiver's weight-carrying trailer rating, the tongue weight is over its weight-carrying tongue rating, or the trailer is over the line your owner's manual draws. Here is where four makers draw that line:
| Vehicle | What the maker says | Source |
|---|---|---|
| Ford F-150 | Weight distribution required over a 5,000 lb trailer | Ford, 2026 RV & Trailer Towing Guide, F-150 conventional towing notes, PDF p. 15 |
| Toyota Tundra | Required over 5,000 lb (2,268 kg); sway control device over 2,000 lb (907 kg) | Toyota, 2024 Tundra Owner's Manual (Short Version) OM0C065U, Trailer towing, pp. 139 to 141 |
| Ram 1500 | Recommended over 5,000 lb | Ram, 2025 Ram 1500 Payload and Towing Weight Capacities, footnotes |
| Chevrolet Tahoe and Suburban | Weight distribution and sway control required over a 600 lb tongue | Chevrolet, 2026 Trailering Guide, Suburban/Tahoe trailer weight ratings, PDF p. 41 |
Notice the Chevrolet line is a tongue weight, not a trailer weight, and tongue weight is often what trips the label too. A 4,800 lb trailer with a 600 lb tongue behind the F-150 receiver is under its 5,000 lb trailer rating but over its 500 lb tongue rating, so it needs weight distribution all the same: the calculator says needed for that case. On a label like the F-150's, 500 lb is 10% of 5,000 lb, so any tongue heavier than 10% of the trailer hits the tongue rating before the trailer reaches the trailer rating.
Guidance from the vehicle maker, not law. These lines are in owner's manuals and towing guides. We have not found a provincial or state statute that names weight distribution hitches. The maker's line is still the one your warranty and your receiver are rated against.
Read the two ratings on your receiver label
A receiver is rated twice. Ford says so directly: "See Hitch Receiver Weight Capacity chart for the weight-carrying and weight-distributing capacities of these hitch receivers. (These capacities also are shown on a label affixed to each receiver.)" The weight-carrying pair is what the receiver may hold with a plain ball mount. The weight-distributing pair, usually higher, applies only with a weight distribution hitch in place.
Ford's chart for the F-150 receiver is a typical label: 5,000 lb trailer and 500 lb tongue weight-carrying, 13,500 lb and 1,400 lb weight-distributing (with the Tow/Haul Package and Max Tow Axle). Those are the calculator's defaults. Your own label is on the receiver tube; replace them with what it says.
Worked example: a 7,000 lb trailer behind that receiver
- Tongue weight not weighed, so it is estimated at 15%: 1,050 lb (476 kg).
- Trailer 7,000 lb (3,175 kg) is over the 5,000 lb (2,268 kg) weight-carrying rating, and over Ford's 5,000 lb line.
- Tongue 1,050 lb (476 kg) is over the 500 lb (227 kg) weight-carrying tongue rating.
- Both are inside the weight-distributing ratings, with 350 lb (159 kg) of tongue to spare.
- So: weight distribution needed, with bars rated for a pair at 1,250 lb (567 kg) or a little more (tongue plus 200 lb of cargo in the bed).
The hitch head has ratings of its own too. Husky rates its Center Line TS at 600 lb tongue and 6,000 lb trailer when used without bars, and CURT says that without bars the ball sets the rating. Every part of the chain counts; the lowest-rated one is your limit.
What a weight distribution hitch does, and what it does not
Hitch a heavy tongue behind the rear axle and the rear squats while the front rises, which is why H2 is higher than H1 in every maker's set-up method below. That takes weight off the wheels that steer, and Equal-i-zer says too little there costs steering and braking control. A weight distribution hitch uses spring bars, tensioned against brackets on the trailer frame, to push part of that load forward onto the front axle and back onto the trailer's axles. That is Chevrolet's description, and Ford's is the same: the bars lift some weight from the rear wheels and transfer it to the other wheels.
- It does not reduce tongue weight. The ball still carries all of it, and all of it still counts against payload. Check that on the payload calculator.
- It does not raise the tow rating. Ford: trailer towing values are the same for weight-carrying and weight-distributing hitches.
- It does not stop sway on its own, though most come with sway control built in. More on that below.
Types of weight distribution hitch
Every kind has the same parts: a shank in the receiver, a head carrying the ball, a pair of spring bars, and brackets on the trailer frame. They differ in how the bars are held and loaded. Among the hitches we read at source:
- Round bars on chains. CURT's round bar hitch: the bars hang from lift chains on snap-up brackets, and you set the tension by how many chain links you take up.
- Trunnion bars on lift brackets. Husky's Center Line TS: the bars pin into trunnions on the head and rest on adjustable lift brackets, with friction sway control built in.
- Spring arms on L-brackets. Equal-i-zer: arms rest on L-brackets on the frame, and the friction there and at the head is its 4-point sway control. Tension is set with spacer washers and bracket height.
- Hydraulic. B&W's Continuum: a hydraulic cylinder and hand pump load the bars, and a pressure gauge lets you repeat the same setting.
Whatever the design, the numbers that matter are the same: the bar rating for the pair, the hitch's trailer rating, and the restoration you set it to.
What spring bar rating do I need?
Bars are rated by tongue weight, for the pair, not each bar: CURT and Husky both print that on their instructions. What goes into the number differs by maker.
- Blue Ox uses Total Tongue Weight: the loaded tongue plus any cargo behind the tow vehicle's rear axle. "you will also need to include the weight of any cargo that will go behind the rear axle of your tow vehicle. This is referred to as the Total Tongue Weight or TTW."
- Equal-i-zer adds the tongue and "about 1/3 of the cargo weight that is in the back of your tow vehicle". Its own example: 825 lb tongue plus 250 lb gives 1,075 lb, so a 12,000 lb model.
Read them at source: Blue Ox, How Do You Know Which SwayPro Is Right For You?, Equal-i-zer, Which Equal-i-zer Hitch Model Do I Need? and CURT, Round Bar Weight Distribution Installation Instructions (17050 to 17057). The calculator gives both and leads with the larger, Blue Ox's. Both count cargo behind the axle because it loads the rear of the tow vehicle the way the tongue does.
| Loaded tongue | No cargo behind axle | 200 lb behind axle | 500 lb behind axle |
|---|---|---|---|
| 500 lb (227 kg) | 500 lb (500) | 700 lb (567) | 1,000 lb (667) |
| 700 lb (318 kg) | 700 lb (700) | 900 lb (767) | 1,200 lb (867) |
| 900 lb (408 kg) | 900 lb (900) | 1,100 lb (967) | 1,400 lb (1,067) |
| 1,100 lb (499 kg) | 1,100 lb (1,100) | 1,300 lb (1,167) | 1,600 lb (1,267) |
| 1,300 lb (590 kg) | 1,300 lb (1,300) | 1,500 lb (1,367) | 1,800 lb (1,467) |
Bars come in steps, and the steps are not the same across makers, so pick the first pair at or above your number. Do not go far above it: CURT and Husky sell bars in ranges with a floor as well as a ceiling (CURT's include 800 to 1,000 lb), and Equal-i-zer notes that a higher rating is a stiffer set-up. The hitch's trailer rating must also cover the loaded trailer, and the ball must be rated at or above the trailer's gross weight.
How to set up a weight distribution hitch: front axle load restoration
Front axle load restoration (FALR) is how much of the weight the front axle lost on hitching the bars put back. The makers we read all measure it with three fender heights (Toyota would rather you weigh the front axle, and uses the fender when you cannot):
- H1: truck loaded for the trip, unhitched. Ground to the top of the front wheel opening, above the wheel centre.
- H2: trailer on the ball, bars not loaded, tongue jack fully up. The front will have risen.
- H3: bars loaded. Adjust until H3 reaches the target.
Target H3 = H2 minus (H2 minus H1) times the restoration percentage. Ford's own example: F-150, H1 37 in, H2 38 in, 50%, target 37.5 in. Enter your three heights in step 4 of the calculator and it does this for you, and reports the percentage you actually got.
| Maker | Target | Source |
|---|---|---|
| Ford | 50% on F-150, F-150 Raptor, Expedition, F-250/F-350 and Super Duty Chassis Cab; 25% on F-450 Regular Cab | Ford, 2026 RV & Trailer Towing Guide, Calculate Weight Distribution, PDF p. 8, and pickup notes, PDF p. 20 |
| Ram 1500 (air suspension) | Fender about one third of the squat above H1, which is about 67% | Ram, 2025 Ram 1500 Owner's Manual, Trailer Towing, pp. 187 to 189 |
| Toyota Tundra | 100%: back to the unhitched height, and never below it | Toyota, 2024 Tundra Owner's Manual (Short Version) OM0C065U, Trailer towing, pp. 139 to 141 |
| Equal-i-zer | 50 to 100%, never over 100%, unless your vehicle manual says otherwise | Equal-i-zer, Owner's Manual, 6K to 14K models, Steps 6 to 9 and Appendix |
| B&W | 50 to 100% where the vehicle maker gives no figure | B&W Trailer Hitches, Continuum Weight Distribution Hitch Installation Manual |
Guidance, not law. Your vehicle's manual comes first. Where it gives a figure, use it, even if a hitch maker's range says something different.
Too little, too much
- Under-distributed (under 50% in Equal-i-zer's terms): too much on the rear axle, weaker steering and braking, less resistance to sway. The truck still looks squatted. Add tension.
- Over-distributed (over 100%): the front ends up lower than it started and the rear loses traction, which Equal-i-zer and CURT both warn can lead to a jackknife. CURT's rule of thumb: the loaded ball height should never be greater than the uncoupled ball height. Husky's: the rear fender should not settle lower than the front.
- Air suspension or auto-levelling reduces what the hitch transfers. Equal-i-zer says 4-corner levelling cuts it by 20 to 25%, so set 75 to 100% if it cannot be switched off. CURT and Husky say to deflate air springs to their minimum before setting up.
- Trailer pitch: Equal-i-zer adjusts ball height if the trailer frame's front and rear heights differ by more than 1 1/4 in. Ford asks for level to slightly nose down.
Sway control vs weight distribution hitch
Weight distribution and sway control are two different jobs that often come in one box. Weight distribution moves load between axles. Sway control resists the trailer pivoting on the ball. There are three kinds:
- Built into the hitch. Equal-i-zer's 4-point head and Husky's Center Line TS use friction in the head and brackets. Husky says not to add a second friction sway control to it.
- An add-on friction bar, a telescoping link between the receiver and the trailer tongue that Ram describes. It works on a weight-carrying hitch too, which is how you get sway control without weight distribution. It bolts to a small sway control ball on the hitch head or ball mount; CURT's round bar head takes two. CURT recommends a sway control device for trailers with a large surface area, such as travel trailers.
- Electronic Trailer Sway Control in the truck, which brakes individual wheels and cuts power when it senses sway. Ford, Chevrolet, Ram and Toyota all fit it.
Some makers require sway control on its own, below any weight distribution line: Toyota requires a sway control device over a 2,000 lb (907 kg) trailer on the Tundra and on the 2026 RAV4 Hybrid. Chevrolet ties weight distribution and sway control together on the Tahoe and Suburban.
Trailer sway: what causes it
Chevrolet's guide puts it plainly: "Sway refers to instability of the trailer relative to the tow vehicle, and often results from improper weight distribution, excessive speed or overloading." The full list from the makers' manuals:
- Too little tongue weight. Husky: "Too low a tongue weight often produces tendency to sway." Ram says a trailer loaded heavier at the rear can sway severely.
- Speed. Chevrolet calls it a major contributor. Toyota: swaying increases as speed increases.
- Overloading the trailer or the tow vehicle.
- Crosswinds, passing trucks and rough roads.
- Tire pressure and condition, on the truck and the trailer.
- A short wheelbase tow vehicle, which Husky says may induce sway.
- A weight distribution hitch set too light: Equal-i-zer says under-distribution reduces resistance to sway.
What to do when your trailer sways
- Hold the wheel steady and straight. Do not try to steer out of it; Chevrolet says that will likely make it worse.
- Ease off the accelerator, gradually. Do not speed up.
- Do not press the brake pedal. Ford warns that the tow vehicle's brakes can increase sway.
- With electric trailer brakes, apply them by hand with the controller until the sway stops.
- Once it settles, slow down and stop somewhere safe.
That is the procedure in Chevrolet's guide, Ford's guide and Toyota's manual. Then find the cause: Toyota says to check the tires, whether the load has shifted, the tongue weight, and the load in the vehicle. If nothing is wrong, the speed you were doing is over that combination's limit, so tow slower.
Sway checks before you blame the wind
- Tongue weight. Weigh it. Chevrolet, 2026 Trailering Guide, p. 8 gives 10 to 15% of the loaded trailer for a ball hitch; under the bottom of that is where sway starts. The tongue weight calculator checks yours. Guidance, not law.
- Load placement. About 60% of the load in the front half of the trailer, heavy items low and near the axle, balanced side to side (Chevrolet, Ford, Ram).
- Tire pressure on both vehicles, at the vehicle and trailer makers' towing pressures.
- Hitch adjustment. Restoration inside your vehicle maker's target, trailer level, bars rated for your tongue weight.
- Sway control fitted and working, where your vehicle maker calls for it.
- Speed. If it sways at 60 mph and not at 55, the combination is telling you its limit.
Ram is blunt about the second one: loads balanced over the wheels or heavier at the rear "can cause the trailer to sway severely side to side". For the full loading method, see the tongue weight page.
Torque, grease, noise and backing up
- Torque. Use your hitch's own figures. For example, Equal-i-zer's 6K to 14K manual gives 320 ft-lb for the 3/4 in shank bolts, 65 for the link plate bolts, 75 for the L-bracket bolts and 60 to 100 for the socket bolts.
- Grease and noise. Equal-i-zer: clean and grease the head's friction surfaces and the ball before each trip, but not the arms or L-brackets; a clean, greased hitch makes less noise. CURT: keep the bar sockets lubricated. Husky Center Line TS: do not grease the friction surfaces, they are the sway control.
- Backing up. Equal-i-zer says to disengage the bars before backing over a sharp change in grade. B&W says the Continuum can be backed with the bars attached.
- Rough roads and boat ramps. Equal-i-zer: never tow with the hitch engaged on rough roads, through deep ditches and dips, or while launching a boat; it strains the spring arms and head.
- Surge brakes. Ram warns weight distribution may not be compatible with surge brake couplers; ask the hitch and trailer makers.
F-150, Ram, Silverado, Tundra, Jeeps and SUVs
People search by truck, so here is what we have read at source. F-150: required over 5,000 lb, 50% restoration (Ford). Ram 1500: recommended over 5,000 lb; with air suspension, restore to about one third above H1 (Ram). Tundra: required over 5,000 lb, 100% restoration (Toyota). Tahoe and Suburban: required over a 600 lb tongue (Chevrolet).
For anything else, including the Silverado 1500, Ram 2500, Tacoma, Jeep Wrangler, Gladiator and Grand Cherokee, and unibody SUVs such as the Telluride, Atlas or XC90, we have not read that maker's figure yet, so we are not printing one. Look in two places: the label on the receiver and the towing section of the owner's manual. Some vehicles are not meant to have one at all: Ford's table lists the Transit as "Use Not Recommended". Then enter what you find in the calculator. The door sticker page shows where the other ratings are.
Sources
- Ford, 2026 RV & Trailer Towing Guide, F-150 trailer towing information, PDF p. 19 (guidance, not law): A receiver carries two sets of ratings, weight-carrying and weight-distributing, and both are printed on a label on the receiver itself. Ford's chart for the F-150 receiver gives 5,000 lb trailer and 500 lb tongue weight-carrying, and 13,500 lb and 1,400 lb weight-distributing, the weight-distributing figure footnoted as requiring the Tow/Haul Package and the optional Max Tow Axle. Checked 2026-10-24.
- Ford, 2026 RV & Trailer Towing Guide, F-150 conventional towing notes, PDF p. 15 (guidance, not law): Ford's own line for the F-150: above a 5,000 lb trailer, a weight distribution system is required by the maker. Checked 2026-10-24.
- Ford, 2026 RV & Trailer Towing Guide, Calculate Weight Distribution, PDF p. 8, and pickup notes, PDF p. 20 (guidance, not law): Ford's set-up method: measure the front fender lip above the wheel centre unhitched (H1) and hitched with no bars (H2); target height is H2 minus (H2 minus H1) times the correction factor. Worked example on the page: F-150, H1 37 in, H2 38 in, factor 50%, target 37.5 in. The factor table gives 50% for F-150, F-150 Raptor, Expedition, F-250/F-350 and Super Duty Chassis Cab, 25% for F-450 Regular Cab, 'Not Required' for Mustang, Bronco Sport, Escape, Bronco, Explorer, Maverick and Ranger, and 'Use Not Recommended' for Transit. The same guide says trailer towing values are the same for weight-carrying and weight-distributing hitches. Checked 2026-10-24.
- Ford, 2026 RV & Trailer Towing Guide, Hitch Styles, PDF p. 5, and basic towing information, PDF p. 9 (guidance, not law): A weight-distributing hitch is 'Required for certain Class III and all Class IV applications' in Ford's words; its tightened spring bars lift some weight from the rear wheels and transfer it to the other wheels of the vehicle and trailer. On page 9: about 60% of the allowable cargo in the front half of the trailer and 40% in the rear, within the limits of tongue load; and if the trailer sways and it has electric brakes and a controller, apply the trailer brakes by hand with the controller and do not apply the tow vehicle brakes, which can increase sway. Checked 2026-10-24.
- Chevrolet, 2026 Trailering Guide, Trailering basics, pp. 5 and 9 (guidance, not law): A weight-distributing hitch uses spring bars to shift some of the hitch weight forward onto the tow vehicle's front axle and rearward to the trailer's axles. Other causes of sway named: crosswinds, poor vehicle maintenance and road conditions; speed is a major contributor. In a sway: hold the wheel steady, release the accelerator without touching the brake pedal, apply electric trailer brakes by hand until the sway stops, then stop. Loading: 10 to 15% tongue weight, and with the axles centred, about 60% of the load over the front half of the trailer, evenly side to side. Checked 2026-10-24.
- Chevrolet, 2026 Trailering Guide, Suburban/Tahoe trailer weight ratings, PDF p. 41 (guidance, not law): An example of a maker drawing the line on tongue weight rather than trailer weight: on Tahoe and Suburban, above a 600 lb tongue a weight-distributing hitch and sway control are required. Checked 2026-10-24.
- Ram, 2025 Ram 1500 Owner's Manual, Trailer Towing, pp. 187 to 189 (guidance, not law): For the Ram 1500 with air suspension, adjust the bars so the front fender sits at about (H2 minus H1)/3 plus H1, one third of the squat above normal ride height; worked example H1 925 mm, H2 946 mm, target 932 mm. Trailer sway control can be a mechanical telescoping friction link between the receiver and the trailer tongue, or the electronic system that brakes individual wheels. Load 60% of the weight in the front of the trailer. Checked 2026-10-24.
- Ram, 2025 Ram 1500 Payload and Towing Weight Capacities, footnotes (guidance, not law): Ram's line for the 1500: a recommendation, not a stated requirement, above a 5,000 lb trailer. Checked 2026-10-24.
- Toyota, 2024 Tundra Owner's Manual (Short Version) OM0C065U, Trailer towing, pp. 139 to 141 (guidance, not law): Tundra: over a 2,000 lb (907 kg) trailer a sway control device of sufficient capacity is required, and over 5,000 lb (2,268 kg) a weight distributing hitch of sufficient capacity is required. If the front axle cannot be weighed, adjust until the front fender is back at its unhitched height, and do not bring it below the original measurement: 100% restoration, never more. Checked 2026-10-24.
- Toyota, 2026 RAV4 HV Owner's Manual (OM0R160U, USA and Canada), Trailer towing (guidance, not law): Toyota's sway procedure: grip the wheel and steer straight ahead, do not try to steer out of it, release the accelerator very gradually, do not apply the vehicle brakes. Once stopped, check tires, the trailer load and tongue weight, and the load in the vehicle; if nothing is wrong, the speed at which it swayed is beyond that combination's limit, so drive slower, because sway increases with speed. Over a 2,000 lb (907 kg) trailer a sway control device of sufficient capacity is required. Checked 2026-10-24.
- Equal-i-zer, Owner's Manual, 6K to 14K models, Steps 6 to 9 and Appendix (guidance, not law): Measure the front wheel well uncoupled (A), coupled with no spring arms (B) and with arms engaged (C); weight distribution % = 100 x (B - C) / (B - A); target 50 to 100%, never over 100%, or less than the tow vehicle manual's minimum. Under-distribution leaves too much on the rear axle and costs steering, braking and sway resistance; over-distribution takes too much off the rear axle and risks loss of traction and jack-knifing. 4-corner auto-levelling cuts distribution by 20 to 25%, so set 75 to 100% if it cannot be switched off. Trailer pitch: adjust ball height if front and rear frame heights differ by more than 1 1/4 in. Ball rated at or above the trailer's gross weight. Torque: 3/4 in shank bolts 320 ft-lb, link plate bolts 65, L-bracket bolts 75, socket bolts 60 min to 100 max. Grease the head's friction surfaces and the ball before each trip, not the arms or L-brackets. Disengage the bars before backing over a sharp change in grade. Never tow with the hitch engaged on rough roads, through deep ditches and dips, or while launching a boat. No set-up guarantees sway will not occur. Checked 2026-10-24.
- Equal-i-zer, Which Equal-i-zer Hitch Model Do I Need? (guidance, not law): Equal-i-zer's sizing method: load and weigh the rig, then hitch load = tongue weight + about one third of the cargo in the back of the tow vehicle; pick a hitch whose tongue rating is above that and whose trailer rating is above the trailer's actual weight. Worked example: 825 lb tongue + 250 lb (a third of the rear cargo) = 1,075 lb, so a 12K model. A higher rating is a stiffer set-up. Checked 2026-10-24.
- Blue Ox, How Do You Know Which SwayPro Is Right For You? (guidance, not law): Blue Ox sizes spring bars to Total Tongue Weight: the loaded trailer's tongue weight plus all cargo behind the tow vehicle's rear axle, matched to the bar rating. Checked 2026-10-24.
- CURT, Round Bar Weight Distribution Installation Instructions (17050 to 17057) (guidance, not law): Bar ratings are for the pair, and both bars must carry the same rating. Bars are sold in ranges with a floor as well as a ceiling (for example 800 to 1,000 lb tongue, 8,000 to 10,000 lb trailer). Without spring bars, the rating is set by the ball. The loaded ball height should never be greater than the uncoupled ball height: front wheel overload and loss of rear traction follow. Keep the socket ends of the bars lubricated. A sway control device is recommended, particularly for trailers with a large surface area such as travel trailers, and the round bar head accepts two sway control attachment balls. Checked 2026-10-24.
- Husky Towing, Center Line TS Assembly, Installation, Operation and Maintenance Instructions (guidance, not law): With spring bars the Center Line TS is rated in ranges (400 to 600, 600 to 800, 800 to 1,200, 1,000 to 1,400 lb tongue); used as a weight-carrying hitch without bars it is rated 600 lb tongue and 6,000 lb trailer. The rating is for the pair of bars. After set-up the tow vehicle should settle evenly front to rear and the rear fender should not settle lower than the front. The integrated sway control must not be paired with a second friction sway control. Deflate air springs to their minimum before set-up. Short wheelbase vehicles may induce sway. Do not lubricate the friction surfaces. Checked 2026-10-24.
- B&W Trailer Hitches, Continuum Weight Distribution Hitch Installation Manual (guidance, not law): FALR is the percentage of the trailer load on the rear tires that is restored to the front; use the vehicle maker's figure where it gives one. Target C = B - ((B - A) x FALR / 100); example A 39 in, B 40 in, 75% gives 39.25 in. The Continuum can be backed up with the bars attached. Sway control is much less important to stability than speed, road and weather, trailer load distribution and tires; if sway occurs, slow down. Checked 2026-10-24.
- Chevrolet, 2026 Trailering Guide, p. 8 (guidance, not law): 10 to 15 percent of loaded trailer weight for a conventional ball hitch, and 15 to 25 percent for gooseneck and fifth wheel. The same page adds that when towing the maximum trailer weight, the maximum tongue weight is 10% for conventional trailers. Checked 2026-10-24.
Every figure in the tables is arithmetic from the sources above or from the calculator's engine.