mounting solar panel

OK, this is not a recomendation, but is how I attached a solar panel to the roof of my class A several years ago. I did not feel comfortable putting screws thru the rubber roof, so I purchased two 2" X 3" aluminum strips three feet long. I used marine 5250 adhesive to mount these strips to the roof, I then mounted the solar pannel to the aluminum strips. Never had a problem, no leaks, as far as I could tell no problems with the roof material, and everything stayed put. I had the Class A 5 years after doing the solar addition. I purchased the solar panels at Harbor Freight and they were a trickel charge for the four T106 batteries.