As a side note, I put 4 each 100 watt solar panels on a Holiday rambler fifth wheel, and barely covered any of the roof. So installing a 500 + watt system is really practical, as far as roof coverage.
I made my own mounts, with 6" long pieces of 2" aluminum angle metal, with 3 each 3/16" holes on one side and one 5/16" hole for a 1/4-20 bolt into the solar panel frame on the other. This lifts the solar panels about 1" off the roof, so cooling air can get under it, and keep the temp down. Cooler panels make more power.
Fred.
