What Size Weight Distribution Hitch Do I Need?

Size the hitch by your loaded tongue weight, and pick the rating band that puts your real figure comfortably inside it rather than at either edge. Tongue weight is commonly in the region of 10 to 15 percent of loaded trailer weight, so a trailer that actually weighs 7,000 pounds loaded lands somewhere around 700 to 1,050 pounds on the ball — before you add anything stored in the truck bed ahead of the axle. Bars rated far above your tongue weight tow harshly; bars rated below it do not do the job at all.

This is part of our towing and security guide, and it assumes you have already settled whether you need one.

Why bar rating is about tongue weight, not trailer weight

Spring bars work by being tensioned to a specific load. Their rating describes the tongue weight range over which that tension does what it is supposed to do. A bar rated well above your actual tongue weight is stiffer than the load it is carrying, so the trailer transmits every bump through to the truck and the ride goes hard. A bar rated below your tongue weight is being asked to distribute more than it can, and it simply does not transfer the load forward.

Trailer weight comes into it only as the way you estimate tongue weight. Two trailers of identical total weight can have meaningfully different tongue weights depending on where the axles sit and where the heavy items are.

The arithmetic, with the part people miss

The forward-bias point is the one that catches people. A travel trailer's fresh water tank, propane bottles, battery and front pass-through storage are all at or ahead of the axles, which means a disproportionate share of that weight ends up on the tongue. Loading the front compartment with leveling blocks, a sewer kit and a toolbox can move tongue weight by enough to cross a rating band.

Choosing the band

Manufacturers publish bars in bands — a commonly seen set runs roughly 600, 1,000, 1,200 and 1,400 pounds, though the exact figures vary by maker and you should read the chart for the hitch you are buying. The rule is the same whoever makes it: your measured tongue weight should sit inside the band with margin at both ends, not within a few pounds of the top or bottom.

If your figure lands right on a boundary, the usual advice is to take the larger band only if you expect to load heavier in future, and the smaller one if the trailer is already loaded the way it will stay. An over-rated bar is the more common mistake and the one that produces the complaint that the hitch made the ride worse.

Hitches that publish clear sizing bands

All three are sold in several tongue-weight ratings. Read the band chart against your measured figure before ordering, not after.

Best for Sway control built in

Equal-i-zer 4-Point Sway Control Hitch

Weight distribution with sway control built in rather than bolted on. Size it to your real tongue weight and let a shop set it up once.

$552.66 - View on Amazon#ad we may earn a commission - price as of November 12, 2026

Best for Availability and parts support

CURT TruTrack Weight Distribution Hitch

The widely stocked option: integrated sway control, several weight ratings, and parts you can actually source mid-trip.

$448.95 - View on Amazon#ad we may earn a commission - price as of November 12, 2026

Best for Weight, and easier hitching

Andersen No-Sway Weight Distribution Hitch

The light one. Far easier to handle than steel spring bars, at the cost of being different from every hitch tutorial you will read.

$789.98 - View on Amazon#ad we may earn a commission - price as of November 12, 2026

Getting the number without guessing

There are three ways to arrive at a tongue weight, in descending order of how much you should trust them.

A public scale, in two weighings. Weigh the whole rig with the trailer hitched, then unhitch and weigh the tow vehicle alone. The difference is close to the tongue weight. This is the method to use if you are anywhere near a rating boundary, and truck stops and grain scales both do it for a small fee.

A dedicated tongue weight scale. A purpose-made gauge sits under the coupler and reads the weight directly. More convenient than a scale trip if you expect to re-check after changing how you load, and it measures the one number this page is about rather than deriving it.

The percentage estimate. Taking 10 to 15 percent of loaded trailer weight is a reasonable starting point and nothing more. Use it to work out which band you are probably in, then measure before you buy if the answer is close to an edge. What it cannot tell you is how your particular trailer distributes its load, which is exactly the variable that matters.

Whichever route you take, weigh or estimate the trailer loaded the way you tow it. A trailer weighed empty gives you a number that is correct about a trailer you do not own.

Three things that change the answer

How you load the trailer

Moving heavy items behind the axles reduces tongue weight — and taken too far it causes sway, which is far worse than a slightly high tongue weight. Do not load to hit a hitch rating. Load for stability, measure the result, and buy the bars that match.

Whether you tow with full water

A full fresh tank is a significant load, and whether it is aboard changes your tongue weight noticeably. If you sometimes tow full and sometimes empty, size for the full case — that is the condition the hitch has to handle.

The receiver, which has its own limit

A hitch rated for more tongue weight than your receiver can carry is not an upgrade. The weakest published rating in the chain is your real limit, and it may be the receiver, the ball mount, the ball, or the vehicle. Check all four.

For which hitch to buy once you know the band, see best weight distribution hitch and the head-to-head in Equal-i-zer versus Husky Centerline TS. The same tongue weight arithmetic has a second use on a half-ton truck, where the hitch’s own weight comes off your payload alongside it — see best weight distribution hitch for a half-ton truck.