grnxnam said:yeah, might not work. My cover has 2 panels instead of 3. I'm thinking that if the spacing between the front and rear cross bars is adjustable then I should be able to attach both of them to my rear panel. Now assuming thats possible and assuming the whole set up weighs less than 15lbs or so, then it should work.
if it was under 15lbs. you could go with the yakima boa mounts, they don't use a long tray that connects between towers.
http://www.yakima.com/Product.aspx?Number=8002065