Are you sure the black spots are not mold? If not there are many do it yourself roll on roof coatings. I would certainly do that before comitting to a complete roof replacement. Cost for do it yourself will be in the very few hundreds, and you labor or hiring someone for their labor and you supply the product.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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