Ease up on the armchair quarterbacks. Anyone can have an opinion on the best way to handle the event and the OP is past it.
Yes, you can clad the wheel well with some steel, thick rubber, or anything else you feel will help in the event of another blowout. You've seen, firsthand what a deflated steel belted tire can do when it shreds and there isn't much that will withstand the forces for long.
FWIW, when I bought my Starcraft, I could open the kitchen cabinet and see the top of the tires and the ground, also the 10 lbs of mud from driving on a dirt road in the rain. I had no choice but to replace the wheel well. I built a frame, clad the corners with aluminum trim, and then used 404 steel sheet goods to clad the wheel well. 404 is what garbage trucks use for the hopper and what Humvees have for armor. I sealed the corners and covered the steel with bedliner. I'm going to assume the 404 steel will protect the trailer in the event of a blowout if I see or sense the blowout quickly. I think even the 404 steel will be cut by the spinning steel belts of the tire if driven long enough in that condition. A guy can only do so much.
