It's a common problem for those type of caps. I see many brands that have that problem. That's why they went to fiberglass caps. Not sure it's a delamination or just thin material that warps.
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Mark & Susan
Lehighton, Pennsylvania
EAGLE HT FIFTH WHEEL | 30.5CKTS - '13 Ford F150 SCREW - PullRite Superslide - Roadmaster Active Suspension Member - "Northeast Adventures RV Rally Group" & "Mason-Dixon Bunch"
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