How to repair damage underbelly

I have just bought a 1999 2720.

The underbelly was damaged. The aluminum sheeting has been punctured as well as some of the insulation. No damage inside. See the attached pictures. Any ideas how to repair?

[B_and_D]

When we had a blowout, a piece of the trailer bottom was ripped out behind the wheelwell. I bought a piece of sheetmetal, filled the gap with expandable foam, trimmed off what stuck out when it dried, cut the sheetmetal to fit around the gap, and then either pop-riveted it or used sheetmetal screws to secure it into place (I forget which one, it's been about 4 years since it's happened). It was a fairly easy fix. I didn't caulk around the edges, but I guess you could to that to make it even more watertight.

[grill-n-go]

Depending on how big of a gash that is, you may want to consider "mighty putty". I fixed a gash on my roof that way. It's sandable, paintable, and waterproof.

No, I'm not rehearsing for an infomercial career.

Thanks for your replies.