OK, although I didn't get a specific answer as to what the tiny bumps are, the RV dealership noted a small water leak close to those bumps. Also, they said that I had tons of cracks in the sealant on the roof. I certainly believe this to be true. I wonder if this is a defect in the sealant that the manufacturer used. They had to strip everything off and apply new product over the entire unit. Pricetag--$550. I hope I don't have to do this again anytime soon. And who knows how much the inside repair job will be...I thought these rubber roofs were a good thing.
2007 X160; Nissan Frontier 2016 6cyl