Sounds like delamination. Unfortunately, the biggest cause of delamination is water damage. But in your case, it could be either that or simply stresses.
You really need to determine how it happened before fixing.
Typically, delamination issues can be fixed by gluing everything back together. Small areas can easily be done by the RV owner, but large areas might be structural and should be looked at by a RV shop.
The only thing that works on a RV is the owner...