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Protect just about any trailer from theft with this universal coupler lock, which uses a unique "ball" and shackle to fit a variety of coupler sizes and styles. Secures trailer when it is not in tow.

This rugged, rustproof aluminum trailer coupler lock simply yet effectively deters towaway theft of your trailer that has a lunette-style coupler. Fits lunette rings with 2-1/2" or 3" inner diameter. Padlock sold separately.

This rugged, rustproof aluminum trailer coupler lock simply yet effectively deters towaway theft of your gooseneck trailer that has a Bulldog, Stallion, Superior, or T.E.M. coupler. Padlock sold separately.

Fight back against trailer thieves with this rugged, rustproof aluminum trailer coupler lock. Simple yet effective, it deters towaway theft of your trailer that has a Bulldog Collar-Lok coupler. Padlock sold separately.

This rugged, rustproof aluminum trailer coupler lock simply yet effectively deters towaway theft of your trailer that has a lunette-style coupler. Fits lunette rings with 2-1/2" or 3" inner diameter. Includes stainless steel padlock.

Fight back against trailer thieves with this rugged, rustproof aluminum trailer coupler lock. Simple yet effective, it deters towaway theft of your trailer that has a trigger-style, latch-style, or handwheel-style coupler. Padlock sold separately.

Fight back against trailer thieves with this rugged, rustproof aluminum trailer coupler lock. Simple yet effective, it prevents removal of the inner tube of your gooseneck coupler to help deter towaway trailer theft. Padlock sold separately.

Heavy-duty collar locks around your fifth-wheel trailer's king pin, ensuring that it cannot be attached to anyone else's hitch.

Fight back against trailer thieves with this rugged, rustproof aluminum king pin lock. Simple yet effective, it deters towaway theft of your fifth-wheel trailer. Padlock sold separately.

This rugged, rustproof aluminum trailer coupler lock simply yet effectively deters towaway theft of your gooseneck trailer that has a Bulldog, Stallion, Superior, or T.E.M. coupler. A second lock secures the inner tube. Includes 2 padlocks.

Fight back against trailer thieves with this rugged, rustproof aluminum trailer coupler lock. Simple yet effective, it deters towaway theft of your trailer that has a Bulldog Collar-Lok coupler. Includes stainless steel padlock.

Keep thieves from stealing your trailer with this easy-to-use, tube-style trailer coupler lock. The lock goes through your trigger-style latch to protect your trailer when it's hooked up and when it's not.

Combo pack offers theft protection for your trailer with the butterfly-style coupler lock and secures a ball mount or hitch accessory with the receiver lock. Chrome-plated steel resists rust. Ball-bearing locking mechanisms provide extra security.