I've seen a few trucks around town that have hard plastic tonneau covers. Does anyone know where to find these? I've looked around the net but can't seem to find any that haven't shut down.
I had a '68 Chevy, and I made mine from 3/8" treated plywood, then covered it with black vinyl. Worked great, and it folded longitudinally and laterally thanks to some piano hinges...
As for the plastic ones, I did a quick search and come up with nothing...
When you say plastic are you referring to the fiberglass style such as this: http://www.leer.com/Truck-Tonneaus. These are pretty salty, so judging by your subject line question, this probably not work for you. Other alternatives are the folding style and the soft vinyl covers.