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,FMCA."We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution. "Abraham Lincoln"