Installed 4 of the same Renogy 100 W panels that you have on our AF 811 last year, although not the same roof type, ours being TPO membrane there are similar considerations to take into account those being the covering not bonded to the substrate and uplift from traveling speeds and the occasional big blows. I would not be concerned with roof penetrations with the use of liberally applied RV sealant. Screws and lots of them are going to be your friend in the fact that your panels are not going to leave your roof! Granted the thin ply that is under does not provide great fastening it does give a certain degree of mechanical bonding which is what I wanted to achieve.
I did not feel comfortable with standard Z tabs giving enough holding strength, made our own with aluminum angle, 2 inch and 1 1/2 respectively the main feet being 4 inches long with 3 screws # 10 1 inch in each with 6 feel for each panel. Search Jack Meyer and Handy Bob for great solar install info. I "Love" my solar!
