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Loose hitch pins are one of the more annoying noises you'll deal with while towing, and this Trimax pin is built specifically to fix that. Instead of a standard pin-and-clip, it uses a hollow core with an adjustable, lockable mechanism so you can tighten out the play between receiver and shank, then secure it with the included keys.
Good pick for anyone tired of hitch clunk on rough roads, or who just wants their receiver locked when the trailer's hooked up or parked.