I put two Prowler 13's in the bed of my Tacoma with a bed extender. I just lay them on their tops. One overlaps the other, but they don't move at all. It's really not a problem. Hasn't caused any damage yet.
Edit: You can probably carry more kayaks than you think...
http://www.bigwatersedge.com/bwevb/s...ead.php?t=8826
