They say "Water always wins. That's why there's a Grand Canyon." Seriously, constant water on a flat roof along with all that movement. But we have a 2003 Class C with a fiberglass roof and have only had leakage with one area near the front overhang at a seam, so not too bad.
In 25+ years the only leak I had in my Class C was from a side window which prompted me to remove and reseal all the side windows (all RV's should have there windows resealed eventually).
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