Sounds like we might be able to make it a couple of nights.
Running the powered vent on a lower speed might get it down to 2amps.
We will keep light and water (pump) usage to a minimum.
CO detector is AA battery only, Propane Detector is 12v to the coach battery.
Fridge and Water Heater will be on Propane.
Its summer so won't be using the furnace.
I'll check the battery voltage with a DMM after the first night, and charge with an AC charger if I can get extension cords to reach or the Truck if I have to.
