As much as you may love towing around that big, shiny boat or pair of snowmobiles, you cannot always be there to stand guard. At some point in your towing adventure, your vehicle and trailer will probably need to be left unattended for a period of time – at the gas station, campsite, boat landing, wherever it might be. There is, however, no need for undue worry. CURT trailer locks are designed to protect your towing rig and equipment by preventing a trailer ball from being inserted into the coupler. This ensures that your trailer will only be towed with your permission. CURT trailer locks are key-operated and come in a variety of finishes and styles to fit various trailer types. In the same fashion, we also offer a universal kingpin lock to accommodate 5th wheel trailers. Like CURT trailer locks, the kingpin lock disables the coupling mechanism, preventing the trailer from being hauled off without your knowledge.