Personally I would never run with the propane tanks on, which you probably need to run the furnace. Have you ever seen a motor home burning on the highway, not a pretty sight. If you ever have an accident, especially on the front end, there is a high probably you will have a propane line burst creating an inferno. If you need heat while driving, run the gen set (assuming this runs on another type fuel) and plug in a space heater. Ray