I just put my solar panels on the roof of my trails west campster
. I used mounting brackets I purchased from AM solar. I learned from their web site that on smooth unpainted fiberglass you can mount the brackets with tape that is "stronger than a weld". We shall see...... but I do live in the Sierras and drove it a couple of hours this week down some very bumpy roads, and so far so good.
If I figure out how, maybe I can post a picture. Those panels were heavy and I didn't want to lug them in and out of the trailer. I am really glad they are on the roof!
After looking at AM solar's web site, I can see why they didn't go anyplace. The "tape" is 3M VHB (Very High Bonding). Boeing puts airplanes together using that stuff. Warning the only way to detatch anything mounted with VHB is cut it off. That sounds worse than it actually is, dental floss will work, or piano wire to cut throught the VHB material.
Thanks for posting this, I hand forgotten about VHB.