House batteries still have a draw for things like the CO detector, radio memory and sound like your SilverLeaf system. So even new batteries, given enough time, will draw down (likely several months). Unlike the coach batteries, which typically have one or two Circuit Breaker on/off switches the house batteries, unless one is added, can't be totally disconnected without pulling the either the positive or negative side.
Common way to do this is to remove the negative side. But there are setups where the Magnum BK has been installed on a coach using Magnum where you need to do the positive side otherwise bad karma may happen to your Magnum. So make sure you understand which side can be pulled on your specific coach with any aftermarket stuff that has been added.
Gary 2017 Dutch Star 4369 Spartan
HWH Active Air Centramatic wheel balancers
Box Elder, SD and the road