My coroplast cover had deformed into a contact lens shape. Weights & heat did nothing to flatten it.
When I put in my amp & subwoofer I fit a piece of 1/4" plywood under the carpet in the back of my CRX. It stands up to full cases of oil, a 20lb tool bag, and all the groceries I can get in it. It's lightweight, sturdy, hasn't warped yet, and is very cheap. I've fixed all the leaks so it doesn't much need to be waterproof. Still, a quick going over with a can of varnish would fix that if it were/became a problem.
I made it a bit large and have to wrassle with it to get underneath, like yesterday when I left my lights on and had to get out the jumper cables...
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