FWIW, I only turn on the inverter when I need to get 120 volts from the batteries. I just use it when dry camping and I want to run the entertainment center, etc. I don't have the residential fridge, so I don't need it for that. It is rarely turned on when I go down the road. (For one thing I don't need/want the DVR hd running while bouncing down the road.) I often run the generator and the roof air while going down the road with an outside temperature above about 95° or so. Never have had a problem doing so. But then again I never checked the inverter panel while driving down the road for an error code. Never been an error code lingering afterward. Never had a problem with the roof air units, nor the inverter. So it can be done if the stars all align just right.