Happijac’s innovative Frame Mount Tie Down System puts leverage to work for you. Its design combines frame strength and sound engineering principles to create an I-beam truss structure that makes your camper an integral part of the truck, providing unsurpassed strength and security. Its Direct-to-Frame™ mount is strong and easy to use. While other tie downs may hold your camper down, only Happijac Tie Downs prevent camper movement in all directions (up-down, side-to-side, and front-to-back).