Two bumper hitch mounts one on top of bumper one beneath. bike rack in top one, metal bar in lower one and 8 ft schedule 80 pvc as a mast attached to bike rack, Wok welded to bottom metal rod, and kayak mounts vertically. its gone over 10,00 miles with no problems. ratchet straps holding the mast and through scupper holes in the yak.
Welded a brace on the bike rack base for extra support and padded the wok with a piece of tire to provide cushion and keep nose of yak from being damaged. it a ten ft kay so does not stick up too far above trailer. Truck has a camper shell and is sloped and tall and is too hard to get yak there. i will try to post photos but having issue with posting them. have to lift yak vertically for about 2 ft to get it into wok holder. if it was a 14 ft rack, might worry about wind and low bridges more!