"I have a solar panel, and will add a second. My question is, why attach to the roof? Are you always going to have the camper in the sun?
I set my panel out usually next to the road, where I'll get the most sun, and move it around as needed. Yeah, more work, but I can camp in the shade and find a spot for the panel/charge controller/battery. I always have one battery on the pup, a second one being charged by the panel and off the pup."
I thought about doing it this way but we move around a bit and don't want to deal with tearing down and storing panels (we're space limited). Also want to be charging when traveling. It certaining would be nice for maximizing your solar harvest though.