The most important factor for me to know here is how old was the roof and was there a problem with it. I have worked on RV roofs for decades as part of my work and the overwhelming problem is not the rubber itself. In my experience, that is almost never is a problem unless a tree ran into it or something similar.
When you coat the rubber, you are often putting time and money into the least problematic thing on your roof. The problem is almost always the aluminum molding around the front and sides not being sealed or the roof vents, etc, not being seal. Maintaining the caulk seal there is incredibly important and in my opinion leads to more sidewall delam than any other factor.
Steve and Andra
2012 F350 6.2 gasser SRW LB
Fab Fours front and rear in case we run into a rhino
2019 Northstar Laredo SC