Hitch101.com
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A trailer hitch, also called a receiver hitch or hitch receiver, is a metal weldment that is attached to the back undercarriage of a vehicle for the purpose of towing a trailer or transporting a hitch rack. The trailer hitch consists of a square receiver tube into which you can insert any number of ball mounts (for towing) or hitch mounted racks for carrying bikes or gear. Trailer hitches are typically specific to the year, make and model of a vehicle.
