The black material ( Darco ) can be purchased from a few sources.
I had the same luck as you when I brought the current trailer home for the first time.
I was a bit luckier and had no full intrusion into the cabin.
I did have to replace insulation and the luan (wood / cardboard like crap) and finally the darco.
I bought the darco/scrim tape combo from amazon. The easiest way I found was to use spray adhesive on the luan and then apply the darco and seal off the seams with scrim tape. Use a hair dryer or heat gun on low and a seam roller to help the adhesive on the tape seal better. That's just gets you back to where the manufacture deemed it usable.
https://www.amazon.ca/Mobile-Flex-Me...JZ4Q261E1W309W
There are other links that other folks have tried to make the wheel well a little stronger using more robust products.
Check the remaining tires for make, date of manufacture, and load rating. I was on the way to get new tires for the rig from the dealer, so they were there waiting for me.I went to a load range e from d, and went with Carlisle radial trail hd. I wanted to lessen the chance of near future blow outs.
There are also posts on using TPMS devices to mitigate full blow out situations.
Good luck friend.
