Look at Champion inverter generator series. They have a 3100 watt product that is electric start and big enough to run the roof air. The only down side is that it is heavier than the 2000 watt units from Honda and Yamaha.
Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.