So the results are in! With my Phillips DreamStation and the Resmed AirSense 10 running w/o humidifiers, Hose heaters and WyFy we would suck the batteries to 12.4 to 12.5 volts. So we had something like 75-80% left. This is pretty easy to work with. However, it may not leave enough battery to keep a furnace on all night and keep the trailer @ 55-60 degrees in the winter. I may have to look into one of the little "Mr. Heater" Free Standing Catalytic heaters for real cold nights. My wife doesn't really like Catalytic heaters as they tug on your oxygen levels. But these new ones have low Ox. shut down and Tip-Over shut down too, so I may be able to sell this idea.......Real easy to store when not in use and sets up in a hurry!