Six Month Update/Report:
The black colored product tends to swell in direct sun and remains quite distorted once it cools back down.
S10 4x4 Pick Up Photos by kach22i | Photobucket
A stiffer heavier material may be warranted.
I've replaced the hex screws/washers with slightly longer ones at locations where they were sneaking back up.
I've had the cover off once or twice, much faster/easier than removing a fabric one.
Maybe if the screw holes were much larger there would be half as much swelling/buckling as currently shown.
It works and that's all I care about.