Do you have any pictures? What did the plywood rest on?
It rested on the wheel humps and a little bracework made from 2x3s.
The top was braced with computer mounts that were anchored to the bolts for the hardtop.
pause and listen to some Skynyrd while I look for a photo...
It's a little messy and a 2-door, but you get the idea. The tie-downs are on tracks and can be moved. There are additional tie-downs underneath.
I set the thing up to hold 3 pelicans and 2 duffles on the bottom; the top could hold a 7-gal water jug, 6-gal water jug, chainsaw, and the dog. The generator would then fit in back of the mess.
Be creative...
Real-life picture:
ExPo-approved picture: