I have a truck camper and I've got 600 watts of solar on my roof and I know I can put another 300 up there. You can probably put more up there than you think. One trick I've seen a lot it to make rails or a platform for the panels to mount them over your vents and air conditioner(s). Two of mine are mounted on a roof rack and cover a couple of the vents. That works out really well for me. Now I can open the vents in the rain.haha I hate noise, I'm going camping to be away from everything and have piece and quiet. Don't want to ruin that with a generator more then necessary.
Preferable I would power everything with solar - but I know with the limited roof real-estate I'm working with - I need to incorporate the generator into the design, to have a backup power source.
Of course, you may already be taller than you like and mounting over the AC it too high.