I'm in the same quandary (with a OE2 gestating for March)...my current plan is a metal generatorbox over a Honda EU2020--trifuel and extended exhaust. If, for some reason, the drop in power with propane is a problem, I can haul gas. Probably the propane would be enough to dry out the cabin. My reasoning for the bolt-on box is security for the pricy generator and slight noise reduction (the company says 10%, but doesn't include the exhaust hose)...which will redirect the sound and exhaust away from the trailer. Running the hose 6-10 feet away from the AC air intake would meet what few recommendations I could find. It would be easy to attach the exhaust to the wall of the trailer with suction cups a la Gen-Turi--for festival/mass boondocking. Should charge my Battle-Born LiFePO4 batteries in no time. Altogether a lot cheaper than the roofmounted solar set-up, and you get to run the AC off grid.