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For a Thor, with its TPO roof, I would not rely on just adhesives to attach your solar panels. For fibeglass or aluminum roofs, yes.
But there is a layer of 1/8" or so plywood underneath the TPO that will hold reasonable loads with a wood screw. Macdaddy's Amazon reference above shows #8 or #10 self tapping sheet metal scews tha should work fine. As noted above you only need 3/4-1" length.
Do use a good blob of Dicor or similar sealant above and below the screws.
David
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