Unless Keystone started doing something that I've not seen, your roof is TPO. You can verify that by pulling the garnish ring from the roof vent in the bathroom. You'll see the framework for the vent and the roof membrane will be stapled to the frame (where they cut it diagonally to install the vent). Pull the staples from one of those triangles and compare the front and back. If it's the same color, it's TPO. If it's black on the bottom and white on the top, it's EPDM. I haven't seen an OEM EPDM roof on a Keystone product since around 2013/2014.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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