Trailer coupler lock secures a 2-5/16 in (58.6 mm) cast/Bulldog-style coupler to help deter theft when your RV, boat, or trailer is parked. Built with a reinforced steel body and weather-resistant coating, it adds a physical barrier over the coupler for harder access. The quick-fit nesting style installs fast, while the stainless-steel cylinder and dust cap support smoother locking in outdoor conditions.

When you can’t watch your rig, a visible coupler lock adds a strong layer of security at the hitch point—ideal for storage lots, campgrounds, marinas, and driveways. The nesting design covers the coupler to make access more difficult, while the cushioned interior helps reduce rattle during fit-up. Keep one key on your keyring and store the spares for peace of mind. Grab yours today and lock up before your next trip.