A coupler is the metal piece that physically connects your trailer to the tow vehicle. Once the coupler is permanently bolted or welded to your trailer’s frame rail(s) at the front (this is the “tongue” area), it then fits over the round ball on the trailer hitch attached to your vehicle. Levers of various designs on the coupler clamp around the round ball tightly enough to prevent it from disconnecting, but they also allow just the right amount of play for proper pivoting around turns and over road undulations.
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