It could be spots of corrosion of the aluminum skin. When I replaced our carpet with vinyl tile squares, I noticed a couple of little areas of "just starting" corrosion near the door. I sanded them down a bit and put an extra coat of the 123 Primer that I used to seal the floor before putting down the tiles.
How big are the spots?
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'97 2720 & '01 Chevy Silverado 1500 4x4
2011 & 2017 Prii, 10'x18' & 10'x9' Tents
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