I need help or ideas for a Storage rack to safely transport my planes to the field (bumpy roads) in the back of my 1500 4X4 Dodge with a camper shell.

It should be able to carry different sizes of planes from a 40 size trainer to 1/3 Pitts, 1/4 Cub, Pattern plane, 1/3 Fokker Triplane etc...

I want it to centered around a plywood bottom that can be extended out the back of the truck (on wheels) with folding legs to hold one end with the other end on the tailgate. I've thought about PVC pipe but I can't seem to get any ideas from there.
If anyone has some proven designs with pictures that would be great.