It's odd that many posts on this subject say that putting the Use/Store switch does not stop the parasitic current draws from things like radio, smoke detector, carbon monoxide detector.
On our 2017 Thor Citation Sprinter, when the switch was toggled to STORE,
everything was shut off. No 12v house lights, no radios (including Axxera in dash), back up cameras, indicator lights on CO and smoke detectors were off). After learning the hard way
, I always put it in STORE when parking the MH in the storage lot and never had any issues.
Chassis battery had its own disconnect right above the accelerator pedal(had to wait 10 min. after engine shutoff for the ECM to shut down), which cut off parasitic current draws from the remote keyless system, dome lights, ECM, etc.
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