Our RV rubber roofs have been superb but still not as good as our one piece aluminum roofs as our 97 Lance TC we ordered new, roof still looks like new yet today.
However, our 93 Carriage Carrilite 5th wheel, also we'd ordered new and kept, had a rubber roof that was 20 years old (12 year warranty) and still was in decent shape until a tornado in Feb 2013 went over us in Florida and broke off pine tree branches and the raw broken sharp ends acted like arrows with the needles acting like feathers coming down on the trailer roof and gouging 6 3'-7" long rips in the old rubber membrane roof and 3 had gouges in the plywood under it too. 2 more in the rolled up awning top of the roll.
Our insurance paid for a new layer of wood and a new rubber roof and replacing the awning fabric too with no questions as to age as the adjuster they sent had inspected it and agreed in his written report that the rest of the roof was in good shape. Storm Damage! We were very pleased with the outcome and the longevity of the OEM rubber roof the truth that was upheld.
How much longer would have the OEM rubber roof had lasted before any leaking without the storm damage, we'll never know but 20 years already says something very positive for a rubber roof lasting!