What the RV Industry needs and how it works.

It would have to be thick steel. My Jayco has metal wheel wells.
That said, the metal is so thin, it wouldn't make much of a difference if a tire does blow.

Yes, the tire's spinning belts may abrade the steel, even to the point of making a through hole but plastic just disintegrates and the woven fiber is certainly no match.

FWIW, when I rebuilt my Starcraft wheel wells (plastic), I used 12 gauge 303 steel, the same steel used in garbage trucks and armored Humvees. I figured that would be a good adversary against a spinning radial belt. I have the same steel in a welding bench I built and the darn stuff is near impervious to abuse.