Keeping a rubber roof in top shape does involve a lot of work and a lot of caulk to inspect and replace when needed. It isn't for everyone and not cheap, but when my rubber roof membrane started leaking through the membrane my solution was: rvroof.com. No more rubber roof and no more caulking EVER!
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof