Get your Happijac® camper jack system back in business with a replacement hex drive from Lippert™. Our replacement cranks are designed to help you lift and lower your camper jack system. Happijac Screw Jacks have a 1,500-2,800 lb. capacity per jack. HappiJac Jacks include an outer tube that has been zinc plated and then powder coated for superior corrosion resistance. They also have a wiper at the bottom of the jack to help prevent debris from getting into the jack leg, and a zinc plated inner leg. Replacement hex drive for HappiJac camper jack systems.For more than 50 years, HappiJac has been producing high quality products for the RV industry. HappiJac conducts extensive research and testing to develop quality products backed by sound engineering. HappiJac leads the industry in fully upgradeable camper jacks, space-efficient room slides and the only camper tie down system that effectively controls camper movement in all directions. From bed lifts and slide-outs to tie downs, jacks and toolboxes, we have the solution for your RV needs.Whether you’re on the road or on the water, Lippert supplies a broad array of premium RV, towing, and marine products designed to enhance all of your recreational pursuits. Our team is committed to always thinking about your next journey — pushing the possibilities of our products and services, all to better your time spent outdoors, whenever, wherever, for years to come.