I think the first priority should be for the RV trailer industry to demand better quality tires and to stop using crappy tires from China. I've never had any tire issues because I use truck tires on my trailers but not everyone can do that. Many upgrade to a higher load rating and that seems to also work.
Putting steel in the wheel wells might work on some trailers. I had a Chinese tire blow on my boat trailer (before I knew those tires were a problem) and it mangled the steel fender but saved the boat from damage.
