I realize you may have your answer, but I would be concerned as to what is causing your chassis battery to drain seemingly so fast? There is something draining on it. The question should be what is it and why? While some parasitic drain on house batteries can be expected, I would NOT expect on my chassis battery.
Also, when your chassis battery was dead could you start by using the "emergency start switch"?
I have not had the problem you described but my RV is at the Dealer as we speak to have a new Disconnect Switch on the chassis.
https://www.ebay.com/itm/Car-SUV-RV-...72.m2749.l2649
There are other ways to do and you may do yourself, but for the low cost, I am having the Dealer professionally install in my battery compartment. I plan to use if I am ever in situation of expected extended non use; and no shore power available. It would just be a simple guarantee of no parasitic drain on Chassis battery. In theory your Store / Use switch does the same for House battery; thus it seemed to be okay when set to store with no parasitic drain on your house. Note: It is possible for some parasitic drain to be on House battery as well depending upon how wired.
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