Nothing needed for any RV roof, including EPDM rubber. If you have a rubber roof and feel like something is needed, any of the so-called rubber roof treatments will work as well as the others. Dicor Roof Gard, ProtectAll Rubber Roof, etc.
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