The first question I'd ask is: Do you have insurance on the trailer? If so, you might want to file a claim.
That said, repairing the wheelwells on XLite trailers is an exercise in frustration. The structure is barely adequate to prevent moisture intrusion while towing (tire spray) and certainly won't (as your photos reveal) protect against damage from a blown tire. I'd suspect that the DARCO material (black plastic tarp-like covering) under the wheelwell area is filled with pinholes caused by rock chips flying into the wheelwell. Over the years, I'd suspect that the entire 1/8" lower luan sheeting has rotted away. That has exposed the Styrofoam insulation layer (which has almost no structural strength) and water may have wicked through the cracks in the Styrofoam to damage the top layer which is, at best 1/4" thick luan.
To repair, you're probably going to have to remove the entire wheelwell surface, from the trailer frame rails outboard. You'll notice that there are 3 or 4 outriggers that are "in the way" of repairing the floor from below, so most of the repairs will need to be made from inside the RV. My guess is that you'll find damage inboard as well as outboard of the frame rails.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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