Decided at last minute to take our bikes on our big 3 week camping trip. I did no web research, rather just bought 5 bike fork mounts, had existing 2 x 4's and did a quick build. First simulation: Take board, put bikes on it, decided needed to angle the fork mounts so 5 could fit This is what I ended up with. full 2 x 4 on top, 5 cut 2 x 4 below thinking was give some area to wrap on for hold down/stabilize. I put felt pads below those 5 cut pieces to not mar the pop up top. Leaving shot The board shifted fore/aft, I used nylon rope to secure it and that worked By 3rd campground I changed the attach method, and used the ratching straps as dual hold down and forre/aft stabilizers, that worked perfect for rest of trip This worked so well, any questions I'll answer. Total cost: call it $160: $125 for the 5 bike mounts, $20 for cinch straps, used lefotver 2 x 4 wood, $8 felt pads.