A weight distribution hitch is chosen by tongue weight, not trailer weight, and your tongue weight must land inside the bar rating range.
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Most manufacturers require it once tongue weight passes a stated figure, often around 500 lb, and many require it for any trailer over 5,000 lb. Check your vehicle manual.
Overrated bars ride stiff and transfer more force than the setup needs, which can unload the rear axle and hurt traction. Match the rating to real tongue weight plus anything mounted behind the axle.
Not on its own. It restores axle loading. Sway control is a separate function, either friction bars or an integrated anti-sway design, and many hitches combine both.
Method last reviewed 2026-07-29. Figures are guidance, not a substitute for the ratings printed on your own equipment.