While researching caulk for my RV. These are the Caulks I have found that work for me.
Dicor self leveling, for roof.
ProFlex for windows trim and roof edge. My roof is fiberglass.
OSI Quad, I have only used this a coulple of times. So far it is working well on windows, siding and trim.
2004 Endura 6340D
2012 Chevy Captiva toad