It has a Royal Tuff-Ply roof. The material is TPO and should easily last 20+ years, doesn't chalk, and is much easier to clean than the EPDM rubber you had before. You still have to maintain (caulk) any seams and openings, but the membrane itself is superior to EPDM in most every way. Just wash it with detergent and bleach.
About the only drawback to TPO is that it can still get torn by a tree branch. Fiberglass is superior in that regard.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC