I live in Denver and have the same issue. Several of those plastic retaining strips have buckled and cracked. Some to the point that my vinyl is coming loose and starting to jam the roof shells when closing. I was just now looking on the forum for partial solutions.
As far as heat, I am not sure. my TM is always gararaged and I only camp in the mountains where it doesn't get hot. Seems to me like they are getting stressed from the shell pulling on them whil I have it up. my guess,.
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2004 3326
Reese WD hitch
2013 Ram 1500 Laramie Longhorn
Denver, CO
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