Another vote for Flex Armor.....if you plan on keeping your RV for a while, as it’s not cheap. The application charges are based upon linear feet of coverage, and if roof repairs are needed prior to the roof application! Do some research, it’s darn near “bullet proof”, and eliminates all of the roof seams.
Everything is removed from the roof, the roof is inspected, the mounting flanges, brackets, etc. for all of your roof components are reattached to the roof, then the new roof material is sprayed on. Essentially the entire roof and all flanges, brackets, etc., become part of the roof.....no potential leakage. Then the ac’s, fan bodies, vent caps, etc. are connected to their bases.
We did this two summers ago, including our slide-outs....it’s not cheap, but we thought it was worth the expense. The only potential negative....When it is wet, or has snow on it....it is slick as “snot on a door knob”! We do some fall/winter camping...To remove the snow is an extreme challenge. If videoed, you may make an episode on “Wipe Out or “ Jackass”! You will be on your hands and knees, holding on to whatever is available. Golf shoes would help....but, not recommended! :B