If, by 'residential', you mean a refrigerator which runs on AC only, you are headed for trouble. I doubt that any 'residential' refrigerator would have a battery option, but, in any event, forget about running any refrigerator off the batteries (whether the unit is being towed, or is stationary). You won't be happy. The refrigerator MUST have a propane option, and it will run off the propane automatically whenever the RV is not plugged into AC. I expect your Class A option would operate In the same manner.