If it's oxidizing like that it is probably EPDM. Pull off the inside cover of a vent and look at the roofing material that is flapped over inside. You may have to remove a staple but I've never had to, just sort of pick up the side of it and you can tell right away.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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