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 ...

Close-Up Shot of a Hispanic Man's Hands Closing the Latch on the Trailer Coupler, Attaching the Safety Chains, and Installing the Coupler Pin before Hooking up the Electrical to His Vehicle on a Sunny ...