[elhigh]

Hey,

I totally get not wanting to sell the truck. I could do way better than what my little truck achieves, if I just sold it and got a Corolla and an ultra-lightweight trailer from Northern Supply. But that Ain't. Gonna. Happen.

The truck is a known quantity. I am the only owner it's ever had, and every quirk is like an old friend. Some other hoopy with someone else's quirks is like starting a new job only to discover your new office mate can't stop whistling. There would be bloodshed inside a week.

The heavier plywood should hold up without bowing but you might get better results using lighter wood, and backing the panels with 1x stock, not 2x. If you don't plan on standing on your tonneau, that should be sturdy enough and still light enough for easy removal - which heavier ply might not be.