My Winnebago has an energy management panel. I can run both ACs using my 50 to 30 adapter. The way to ensure they both run is to put my refrigerator on LP along with my water heater and watch power consumption during the heat of the day. If you use a coffee pot or the microwave the energy management system will take an AC off for you. I watch the amperage reading at the panel to decide what I want to run like the TV/Satellite receiver. Turning the inverter off and using sunlight from the shady side or an LED fixture for lighting and the awning to knock some sun off. Every watt counts because my ACs use 24 amps together during the compressor cycle.