I had my canoe up on the sahara with the hardtop on this week. Seemed to work well with 4 foam blocks, 2 overlapping the windshield area and two as far back as I could get them. I was wondering if I could glue the blocks on to (2) 2x4s and use them as a roof rack to haul a kayak and canoe at the same time. Anybody have experience with this, or better ideas? I'm not counting out a roof rack, but they seem like a PITA.