I see many more delamination issues than dented aluminum at the campgrounds I have worked at. Also after touring the factory a few weeks back I was less than impressed with their procedures for laminating the fiberglass reinforced plastic panels they use. I use to vacuum laminating for years and in my opinion they don't have proper adhesion of the panel. When I pointed that issue out to our tour guide I got a blank stare...he, while nice, had no clue.
I purchased aluminum.. Also there is no difference between pinch rolling a flat sidewall and vacuum pressure (actually atmospheric pressure) to apply the non flat panels...it comes down to adhesive, time, temperature humidity and glue coverage.
Aluminum is hung with mechanical fasteners, plastic panels with glue...when you have dissimilar materials, being glued with an adhesive that must remain somewhat plyable due to movement of the metal and plastic panels, along with the movement down the road your asking for issues down the road...especially when you add in weather...120 in Az or minus 40 in Canada... failure is almost guaranteed. JMHO
2011 Toyota Tundra double cab