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A trailer coupler is a mechanical device that connects a trailer to the hitch of the tow vehicle. Trailer couplers come in several different configurations, but all work by clamping around the hitch ball. The means to do this varies somewhat. Some couplers employing a hand wheel to tighten the clamp to the ball; another common arrangement is a lever or toggle to lock the coupler.
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When the lever is flipped to the locked position, the clamp is pulled up against the underside of the hitch ball. Proper adjustment is critical to the safe operation of a trailer, so an adjusting nut is provided on the toggle bolt.The fit should be snug but not binding. Too loose, and there's a danger of the coupler becoming disconnected from the hitch ball.
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Trailer hitch couplers are rated by weight class. The classes are: Class I, trailers to 2,000 lbs. gross trailer weight (GTW); Class 2, trailers to 3,500 lbs. GTW; Class III, trailers to 5,000 lbs. GTW; and Class IV, trailers to 10,000 lbs. GTW. Hitch couplers are also available with capacities up to 15,000 lbs. GTW. Trailer hitch coupler classes also designate the size of the hitch ball, with the smallest being 1 7/8 inches, the largest being 2 1/2 inches.
It's important to match the trailer coupler and ball to the proper loaded weight of the trailer. Doing so will help ensure that the highest degree of safety and legality is met.
