I have a pickup truck with a camper shell (7 foot long bed) and I put a 1/2" thick sheet of plywood on steel angles that creates a upper and lower zone. I can put models on the top deck or the bottom. I put a hook on the top deck with shock cords and lash down the tailwheel with the shock cord, that is the only restraint I have on the model. I do have wood rails that keep the main wheels from sliding to the side to side. I also have a wing rack that allows me to carry two wings up to 80" long without any damage. The bottom has a board that slides out, you load the models on the board and then push the board underneath the top deck. Then once the lower board is pushed all the way forward there is room to put my two field boxes.
I can put the following models in the truck at one time (6 total)
80" camera plane, take apart, wing goes into the wing rack and the fuselage sits on the top deck
80" cub, take apart, wing goes into the wing rack and the fuselage sits on the top deck
MO-1 carrier model - one piece model sits on the top deck
F7F tigercat - bottom board, one piece airplane
Spitfire, 39" span, take apart, fuselage and wing go into blocks that fit the model
Corsair, 43" span, take apart, fuselage and wing to into blocks that fit the model
I also have carpeting on the bottom of the bed, saves the knees.
This setup took a while to make and I custom make the mounts on the bottom board and tie down points on the top deck to match the airplanes that I fly. After I had a flight box tip over and crush a wing I decided it was time to do it right. I can also load the truck in less than 5 minutes with this setup.
Fred C.