I have the same problem on my Coachmen Chaparral and scheduled to drop it off at the dealer on Sept. 14 so they can submit pictures to Coachmen. I observed over the Labor Day weekend at the campground we were staying that it is a problem industry wide. Wildcat, Silverback, Jayco Eagle, etc. All with dark caps but even the silver/gray caps. If you Google you will see all of the complaints as well as on this forum.
Joe and Diane Buskirk
2015 Chevrolet Silverado 3500HD Duramax Diesel 4x4 SWD
2015 360IBL Coachmen 5th Wheel
"Camping is not just a past time it is my relaxing way of life"