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What Size Hitch Do I Need for a 15,000 lb Trailer?

Full breakdown: what size hitch for my trailer.

Quick answer: Class 5 Xtra Duty is rated 16,000 to 17,000 lb gross and 2,400 to 2,550 lb of tongue weight (CURT hitch classes). Ten percent of 15,000 lb is 1,500 lb and 15 percent is 2,250 lb, and 2,250 lb is under 2,400 lb (CURT tongue weight). Class 3 and Class 4, even with weight distribution, stop at 12,000 lb. A separate weight-distribution hitch type is listed up to 15,000 lb, so this trailer is at that ceiling rather than under a Class 3/4 receiver rating (CURT hitch classes).

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Class 5 trailer hitch receivers

Figures for a 15,000 lb trailer

FigureValueSource
Class 5 Xtra Duty gross16,000 to 17,000 lbCURT hitch classes
Class 5 Xtra Duty tongue2,400 to 2,550 lbCURT hitch classes
Class 5 Xtra Duty receiver2 inCURT hitch classes
Class 5 Xtra Duty applicationstrucks and SUVsCURT hitch classes
Class 3 or 4 weight-distribution grossup to 12,000 lbCURT hitch classes
Weight-distribution hitch typeup to 15,000 lbCURT hitch classes
Class 5 Commercial Duty gross18,000 to 20,000 lbCURT hitch classes
Class 5 Commercial Duty tongue2,700 lbCURT hitch classes
Class 5 Commercial Duty receiver2-1/2 inCURT hitch classes
Tongue weight at 10 percent of 15,000 lb1,500 lbCURT tongue weight
Tongue weight at 15 percent of 15,000 lb2,250 lbCURT tongue weight
2 in ball, gross rating3,500 to 12,000 lbCURT hitch balls
2-5/16 in ball, gross rating6,000 to 30,000 lbCURT hitch balls
Gooseneck hitch typeup to 38,000 lb, pickups onlyCURT hitch classes
Brakes and breakaway switchmore than 1,500 lb loadedNHTSA towing safety

The percentage rule is written up on how much tongue weight is safe. Measurement is in the tongue weight guide.

How to size it

Fifteen thousand pounds means the loaded trailer on a public scale (NHTSA towing safety). An unloaded equipment trailer will not stay at the number you used to pick the hitch.

Ten percent of 15,000 lb is 1,500 lb. Fifteen percent of 15,000 lb is 2,250 lb (CURT tongue weight). Under 1,500 lb is under 10 percent and the trailer may sway. Over 2,250 lb is over 15 percent and the vehicle is less responsive, especially turning and braking. Too much tongue weight also takes load off the front wheels; a weight-distribution hitch transfers weight back to the front axle (NHTSA towing safety).

Class 5 Xtra Duty's tongue range starts at 2,400 lb, and 2,250 lb is under 2,400 lb (CURT hitch classes). Its gross range starts at 16,000 lb, and 15,000 lb is under 16,000 lb. The receiver is 2 in, for trucks and SUVs. Class 5 Commercial Duty covers this weight too (18,000 to 20,000 lb gross, 2,700 lb tongue, which is over 2,250 lb) but CURT lists that row for dually and chassis-cab trucks, with a 2-1/2 in receiver. A pintle hitch is a different coupler, listed up to 60,000 lb, not a ball class. If the trailer is a gooseneck rather than a bumper pull, that hitch type is rated up to 38,000 lb and is for pickups only; the ball size is on what size ball for a gooseneck trailer.

A 2 in ball stops at 12,000 lb and cannot cover 15,000 lb (CURT hitch balls). Match the coupler. It needs to call for 2-5/16 in, and the ball you install needs a gross rating above 15,000 lb inside the 6,000 to 30,000 lb range. The rating is gross trailer weight, not tongue weight. Part numbers vary.

2-5/16 in trailer hitch balls for a 15,000 lb trailer

Fifteen thousand pounds is more than 1,500 lb, so many states require a separate braking system and a breakaway switch (NHTSA towing safety). Surge brakes, which are an independent hydraulic system at the hitch, are not legal in every jurisdiction. Check the state motor vehicle administration. Cross safety chains under the tongue, with slack for turns and no dragging. Most states require the chains.

Weight distribution hitches

Class 5 does not add capacity the vehicle does not already have. Read GVWR, maximum trailer weight, maximum tongue weight, GCWR, and GAWR, and use a hitch rated for those same specifications (NHTSA towing safety). Capacity is the lowest-rated component, and no hitch increases the maximum a vehicle can tow (CURT hitch classes). Towing capacity explained is the page for that vehicle limit. Enter the sticker on the trailer tow calculator.

Put a tongue weight scale under the jack. At 1,500 to 2,250 lb you are far past the under-300 lb bathroom-scale case (CURT tongue weight).

Related

FAQ

What hitch class covers 15,000 lb?

Class 5 Xtra Duty, rated 16,000 to 17,000 lb gross and 2,400 to 2,550 lb of tongue weight, on a 2 in receiver (https://www.curtmfg.com/types-trailer-hitches). Fifteen thousand pounds is under 16,000 lb.

Why not a Class 3 or Class 4 weight-distribution hitch?

That column stops at 12,000 lb gross and 1,200 lb of tongue weight (https://www.curtmfg.com/types-trailer-hitches). Fifteen thousand pounds is over 12,000 lb. CURT also lists a weight-distribution hitch type up to 15,000 lb, which puts this trailer at that hitch type's ceiling.

What ball size exceeds 15,000 lb?

A 2 in ball stops at 12,000 lb, so it does not cover 15,000 lb. A 2-5/16 in ball is listed from 6,000 to 30,000 lb (https://www.curtmfg.com/towing-accessories/trailer-balls/learn-more). Match the coupler, and choose a part rated above 15,000 lb gross.

Is the tongue weight inside the Class 5 range?

Ten percent of 15,000 lb is 1,500 lb and 15 percent is 2,250 lb (https://www.curtmfg.com/trailer-parts/couplers/learn-more). Both are under the Class 5 Xtra Duty tongue range of 2,400 to 2,550 lb (https://www.curtmfg.com/types-trailer-hitches).

Compiled with AI assistance from the sources below. Spot an error? Email jpanasuk@gmail.com.

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