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,PPA, Good Sam Life member."We the people are the rightful masters of both the Congress and the Courts - not to overthrowthe Constitution but to overthrow men who pervert the Constitution."Abraham Lincoln