I'm pretty sure that on the Journey the inverter/charger is connected pre-disconnect switch. If you shut off the disconnect you will kill power to the coach but the inverter/charger is still hooked up. If you are plugged into shore power you'll still be charging your batteries and if you are not plugged in you will have to switch off the inverter in order to keep it from drawing on the batteries.
I left my Suncruiser, and now my Bus, plugged in 24/7 without any battery water escaping. If your batteries are boiling dry, your charger is putting out too many volts and needs to be repaired/replaced.
Mark & Leann Quasius
2016 Cornerstone 45A
2007 Allegro Bus 42QRP (Sold)
2012 Jeep Wrangler Unlimited - Rubicon