I used to carry everything on top of my car, but now have a van. I had Thule racks with foam pads on which I would put the first board. On top of the board, I had some blue styrofoam things called "bones". They would lay across the board and I would stack a second and sometimes a third board together on top of one another with the "bones" in between.
They were shaped to fit boards no more than 60 - 70cm wide, but could be trimmed so they could sit flat on a formula board. Then just strap your gear on top. I think it would work if you can find some.
I don't know if they are still available, but you might check the internet to see if they are still around.
Last edited by Ken; 2nd April 2009 at 10:26 PM.