Trailer coupler lock helps deter theft by enclosing your straight-tongue ball coupler and blocking easy access to the latch and safety chains. Built for flat-edge couplers in two common sizes, this heavy-duty hitch lock uses a reinforced carbon-steel shell and weather-resistant coating for dependable outdoor security. Installs in under 30 seconds with one hand, and includes three keys for shared access across your RV, trailer, or boat setup.

When your trailer is parked at a campsite, storage lot, or driveway, a visible coupler lock adds a practical barrier against opportunistic theft. The reinforced steel body and corrosion-resistant surface coating are made for repeated outdoor use, while the internal cushion pad helps stabilize the fit on compatible couplers. Keep one key on your keyring and store the spares in your tow vehicle or toolbox for quick handoffs. Grab yours today and lock up before you unhook.