I know this has been posted tons, but I don't see any recent threads. I just "upgraded" from my previous "pile all the plane stuff in the back of the car" method, to this vast improvement. I put a shower curtain rod wrapped in pipe insulation across the back window of my CR-V, and line everything up across it. It leaves room below for my flight box, fuel, windex, etc., and my TX antenna doesn't poke through my wings.

I hold the rod in place with some little bungees. I was afraid that if I used the spring tension against the windows, that my windows would start to leak.