Built by someone who got tired of the problem The KNOTTLOCK was designed by an engineer who kept seeing the same problem over and over again: when a trailer was stolen, very often the lock wasn’t on the hitch. To stop opportunist theft, the lock needs to be where it belongs — on the trailer. Nobody wants to pull into a service station in the rain, get down on their knees and start assembling a complicated hitch lock. KNOTTLOCK goes on quickly and stays on. The lock that’s on the trailer can protect it. The lock left in the shed can’t.