Personally, I would get a professional opinion from a good body shop who knows fiberglass.
As far as I know gelcoat delamination is a common problem with many brands of rvs . I'm not sure if its a good idea to tackle a large area yourself if its a first time deal for you.
I know that body shops have performed the task of repainting. If that's the case with your rv then you will need a 'dust free paint booth' inside a garage to work.
The rv would need to be taped and wrapped in plastic to protect it from overspray. Surface prep, I would imagine, would be very important to be performed correctly. If that step is not done right then all your work will not last and need to be done over by a professional shop.