Just that happened to me 3 times with our old pop-up. But it usually blew the cheap tires as well, and went right through the floor of the trailer, so it was pretty noticeable when it happened.
I made the mistake of just replacing the springs a couple of times on the side of the road, thinking they were defective. But finally took it to a spring shop who put on heavier ones. Problem solved.
You are doing the right thing. I too used sheet Al to repair the wheel well. But then just covered it with duct tape on the interior. Your idea is much better.
