Tom, if your coach is like mine, you have 2 8D's for the coach and 2 8D's for the chassis. The battery life isn't very good with anything major running. The ice maker, 120 volt lights in the bath and the fantastic fan are the biggest drains on the batteries. The Master switch on the control panel by the entry will turn off all the lights but not kill 12 volt power completely.
Turning off the inverter will also help reduce battery drain.
To make it for 8-9 days, you would be safest to turn off the merge switch and turn off the chassis battery switch in the electrical box on the passenger's side of the engine compartment. That will take the chassis batteries completely out of the loop. Even if the coach batteries run down, the coach will start without a problem. If you really want to take all the power off the coach, turn off both the chassis battery and coach battery switches in the electrical box on the rear wall of the engine compartment. That should completely isolate the coach from the batteries. Of course, that would kill the refrigerator even on propane.
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