With a 4.1 out of five-star rating from over 200 buyers and as a personal recommendation for peace of mind, Harbor Freight sells the Haul-Master Universal Trailer Coupler Lock.

So AMPLock’s designs feature some seriously beefy construction reaching the highest standards of the industry. Take the BRP2516 2-5/16-inch trailer coupler lock.

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The latch pin lock is like the hitch pin lock, except it slides into the trailer hitch latch and locks into place. It can prevent the latch from being lifted and connected to another vehicle.

An even heavier-duty trailer lock is Trimax's UMAX100 universal coupler lock. Like the UMAX50, the UMAX100 trailer hitch lock features a 9/16-inch shackle and offers 360 degrees of solid hardened ...