roof rack for solar

I don't think as long as the panels are parallel with the roof there will be a lot of wind issue. Yes, there will be some gusts upward but my solar generator panels entend above the roof of my truck cab. Of course if Don mounts above the AC unit there will be more distance between panels and roof than my unit. But... I would not put that much weight and wind gust load with attachment to the roof. I would only mount from side of trailer (like the hay rak system). Here is a picture of my solar generator on my truck. There are 2ea 270 watt panels and on my regular cab they completely covered my cab and front edge was out over my hood. On my new truck (crew cab) the leading edge of the panels reach about the front of the cab clicky