Hook up cable. Start up one generator, in regular mode. It will energize both Inverters on both generators, and keep them in 60 Hz phase. Start up second generator in regular mode. Warm the motors up for 2 minutes each. Once the motors are warmed up, turn off all other major electrical loads, like microwave, electric water heater, etc, electrical junk you would use if plugged in to a RV campground pedestal full time, then turn on the A/C. Let AC compressor and fan engage. You do NOT want your voltage dropping below 105 to 106V on start up. Alternately, do a search here for getting an easy start capacitor for your AC unit.
Once AC is up and running and cooling, drop both generators back into Eco mode, to save on fuel.
Or you could read the owners manual for your generator.
