The question of covering or not seems to come up periodically. This morning I was researching who I bought my awning covers from (couldn't remember) because my neighbor was asking (also at TT guy). So, I bought the awning protectors from these guys http://awningpro-tech.com/qa/
and noticed a comment about covers in their QnA section. Don't know if their claims are true but it's kinda scary to think about. I don't cover BTW.
2013 F-350 CC SB 2WD 6.7PS
2013 Eagle Premier 351 RLTS
-SOLD- 2012 X23B
-SOLD- 2003 Ford Expedition 5.4, Bilstein shocks