Personally I would use a good quality silicone on the roof line and the wheel trim and use the DICOR on the roof membrane. Silicone will move with the coaches movement. The DICOR dries hard in my experience.
Caulk repairs are an ongoing issue with any MH or TT, just the nature of the beast. Anything that gets shook up as much as an RV and left out in the elements months at a time will need the caulk looked at least once a season if not more. I usually check mine before the season,after our first extended trip and again in fall before putting up for the season. Someone smarter than I said an ounce of prevention is a whole lot cheaper than a pound of cure or something to that effect.
Mark
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