My X20E has what looks like loose rubber (bubbles) and Jayco told me it was normal as well. So long and you don't snag on a branch, which could happen anyway, I don't see a problem with it.
Wayne, Kim, Mallory & Abby the Dog
2013 - Jayco Jayfeather - X20E
2012 - Toyota Tacoma DBLCB Sr5 with towing package
Equalizer 10k WD, Prodigy P3 Controller, TST TPMS
2012 - Jayco Sport 10 Popup - Traded