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What Size Hitch Ball for a Utility Trailer?

Utility trailers are named on both light-duty and medium-duty rows. The stamp on the coupler is the splitter.

Quick answer: A 1-7/8 in ball is the light-duty size CURT lists for utility trailers, at 2,000 to 3,500 lb. A 2 in ball is the most common size and also lists utility trailers, at 3,500 to 12,000 lb (CURT hitch balls). Match the coupler first. The ball's gross rating has to exceed the loaded trailer, and that rating is not tongue weight.

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1-7/8 in trailer hitch balls

Utility trailer ball and receiver figures

FigureValueSource
1-7/8 in ball, utility trailers2,000 to 3,500 lbCURT hitch balls
1-7/8 in shank diameter3/4 to 1 inCURT hitch balls
1-7/8 in shank length1-5/8 to 3 inCURT hitch balls
2 in ball, utility trailers3,500 to 12,000 lbCURT hitch balls
2 in shank diameter3/4 to 1-1/4 inCURT hitch balls
2 in shank length1-3/4 to 3 inCURT hitch balls
Class 1 receiver and gross1-1/4 in, up to 2,000 lbCURT hitch classes
Class 2 receiver and gross1-1/4 in, up to 3,500 lbCURT hitch classes
Class 2 tongue weightup to 350 lbCURT hitch classes
Class 3 receiver and gross2 in, up to 8,000 lbCURT hitch classes
Tongue weight share of grossabout 10 to 15 percentCURT tongue weight
Brakes and breakaway switchmore than 1,500 lb loadedNHTSA towing safety

How to size it

Split the trailer by the chart before you shop. If the loaded utility trailer is inside 2,000 to 3,500 lb, the 1-7/8 in row is the one that names utility trailers at that weight. If it is inside 3,500 to 12,000 lb, the 2 in row is the one that names them (CURT hitch balls). Worked hitch pages for the two ends of the light row: 2,000 lb and 3,500 lb.

The coupler can disagree with that split, and the coupler wins. Diameter has to match the stamp. A 2 in ball on a 1-7/8 in coupler does not become correct because the trailer is heavy.

Shank diameter is the next check, and the two balls do not share the same range. The 1-7/8 in shank is 3/4 to 1 in. The 2 in shank is 3/4 to 1-1/4 in (CURT hitch balls). Length is 1-5/8 to 3 in on the smaller ball and 1-3/4 to 3 in on the 2 in ball. The shank has to fit the hole. A reducer bushing is what you add when the shank is the smaller one. Class 1 and Class 2 receivers are 1-1/4 in; a Class 3 receiver is 2 in, which is the opening a 2 in ball mount uses (CURT hitch classes). CURT calls the 2 in ball the best fit for most Class 3 hitches.

Capacity comes last and it is gross weight. The part has to exceed the loaded trailer, and two balls of the same diameter can be stamped differently because ratings vary by part number (CURT hitch balls). Tongue weight is not that stamp. It should be about 10 to 15 percent of gross trailer weight (CURT tongue weight). Under 10 percent the trailer may sway. The tongue weight guide covers how to measure it.

Ball mounts for a 1-1/4 in receiver

A utility trailer that looks small can still be over 1,500 lb once it is loaded, and that is the line where many states require brakes and a breakaway switch (NHTSA towing safety). Weigh it. Cross the safety chains under the tongue. A coupler lock keeps the latch from opening if the trailer is parked loaded.

Trailer coupler locks

Cars and crossovers are the Class 1 application, and minivans join them at Class 2 (CURT hitch classes). The vehicle manual's GVWR, maximum trailer weight, maximum tongue weight, GCWR, and GAWR still govern, and the hitch has to handle those specifications (NHTSA towing safety). No ball increases what the vehicle can tow. See towing capacity explained and the trailer tow calculator.

Towing a bike? See what size hitch for a U-Haul motorcycle trailer.

Related

FAQ

Why do utility trailers use two ball sizes?

CURT lists utility trailers on the 1-7/8 in light-duty row (2,000 to 3,500 lb) and again on the 2 in medium-duty row (3,500 to 12,000 lb), which it calls the most common size (https://www.curtmfg.com/towing-accessories/trailer-balls/learn-more). The coupler stamp, not the word utility, chooses the diameter.

What receiver goes with each ball?

Class 1 and Class 2 use a 1-1/4 in receiver, at up to 2,000 lb and up to 3,500 lb (https://www.curtmfg.com/types-trailer-hitches). Class 3 uses a 2 in receiver, at up to 8,000 lb gross and up to 800 lb of tongue weight. A 2 in ball is the best fit CURT names for most Class 3 hitches (https://www.curtmfg.com/towing-accessories/trailer-balls/learn-more).

What shank fits a utility-trailer ball?

A 1-7/8 in ball uses a shank diameter of 3/4 to 1 in. A 2 in ball uses a shank diameter of 3/4 to 1-1/4 in (https://www.curtmfg.com/towing-accessories/trailer-balls/learn-more). The shank has to fit the ball-mount hole. A reducer bushing covers a shank that is too small.

Does a light utility trailer escape the brake rule?

Only if loaded weight is not more than 1,500 lb. Above that, many states require a separate braking system and a breakaway switch (https://dmna.ny.gov/nynm/training/NHTSA_TowingSafety.pdf). Weigh the loaded trailer. An empty utility trailer is not the figure.

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

Sources