Alpha ply roof membrane
IIRC, this junk was only manufactured two years. It was used on the 2012 Rushmore line. My RV service man came to replace the wipers on two slides today. Rubber seal was rotten and gooey. Underneath, the roof membrane had bubbled up and actually had holes in it. Eternabond tape to the rescue! Apparently there was a chemical reaction between the rotten rubber and the Alpha Ply. Just a heads up if you have the Alpha Ply.
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2013 Chevy 3500HD
2012 Rushmore 38CK