I don't have a wiring diagram to refer to, but my feeling is the battery disconnect breaks the circuit to most things inside the rig that would cause a consistent drain on your battery. There are lots of these, the LPG detector, the CO detector, the smoke detector (unless its a battery only model), your stereo will likely cause some drain if its like ours which has a LCD clock displayed all the time (on or off). There are other drains too that are stopped by the battery disconnect. In my pre-Montana trailer - I could have dead batteries within 1-2 weeks of putting it in storage unless i disconnected the batteries from these sources of permeant drain.
Now having said all that, the remote control base unit if you have one, must also cause a drain on your battery and its not disconnected by the battery disconnect. So during winter I disconnect my battery and remove it from the rig (keeping it in my garage, trickle charing it from time to time).
Hope this helps.
Chris
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