What the RV Industry needs and how it works.

westend wrote:

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.

Yes, the galv sheet above the wheels under my Funfinder is pretty thin. It appears to be 1/32" ( 22 gauge ), so it's only one third the thickness of what Westend used in his Starcraft rebuild. Still, it's likely better than nothing at all in the event of a tire coming apart.
It's attached flush to the 5/8" plywood that is the floor, so that makes it pretty stiff.
So far I have not tested out that feature on this trailer.