First you must eliminate the source of moisture that caused delamination.
If your MH is out-of-warranty, I have read of someone fixing a delamination issue by injecting glue into the wall, parking next to a large tree, and using a large board against the sidewall to use a hyd. jack to push the sidewall back into position. I don't know the results though.
This website may offer something useful: Repairing Surface Damage
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired, Good Sam Life member.
The Constitution is not neutral. It was designed to take the government off the backs of people. Supreme Court Justice Douglas