A trailer lock – sometimes called a “hitch lock” or “coupler lock” – is a locking mechanism designed to keep would-be thieves from hitching up to your trailer and driving off with it.
Check price at Amazon 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 ...
Harbor Freight sells the Haul-Master Universal Trailer Coupler Lock, which easily latches onto trailer couplers to prevent would-be thieves from making off with your trailer. The Haul-Master 750 ...