The battery disconnect switches are for long time storage, but be aware there are probably things wired around the disconnect that might still drain the batteries. One should be for the house batteries and one for the chassis batteries. To check, you could turn switches off, then disconnect one battery cable and put a test light or multimeter in the circuit. Any draw should light the bulb or register on the meter.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI