I believe that if you have the latest software update, you can power the BMS down, then on resumption of power later, all the settings are retained. I might be inclind to do so myself, except, unfortunately i cannot get the software update and hence i would need to reset all the settings. This leaves a lot of room for error(user input) for something that must work perfectly every time it is called for. I just like the idea of entering the camper, pressing one button and immediately seeing the voltage of every cell. I'd be inclined to do this more often, than if i was having to fiddle with things.
In my circumstances...the pros of disconnecting are, you cant drain your pack. The cons are, i need to reset all settings every time and it becomes a chore.