It's a '06 5th Wheel Wildcat and our first Rv experience. 2nd owner but we bought it through a crooked dealer and I won't go into detail about all we've learned about what to look for when buying a used trailer!
The mechanic said:
Unscrew and pull caulk off of the moulding pieces surrounding the area of delamination.
*carefully* peal the laminate from the rotted wood making sure not to break the laminate
Take a knife, score and cut out the rotted wood leaving just the foam.
Re-cut more plywood to replace the old rotting plywood
Use the proper adhesive for wood to foam (I can't remember what he
suggested but I was going to get some at his shop when I'm ready)
Clamp it (I'm going to use the building it's parked next to with a carpeted board and some wedge length boards (going to try it out before I start this whole thing to make sure I get proper pressure)
Once that's ready use a contact cement type adhesive to put the laminate back on the wood. Re-clamp.
Screw in the moulding and re-caulk.
Sounds easy, right?