The only reason to turn the switch to 'Stow' would be when you're leaving the RV parked for a long period of time with no 120 v shore power to keep the batteries charged. 'Use' means 'On' and 'Stow' means 'Off.'
As jimnkee mentioned, it only disconnects the house batteries for most functions. The batteries could still be hooked up to gas detectors, clock or radio memory, etc. Over time with no power, the batteries could still discharge. You'd need a second switch and relay to disconnect the chassis batteries, they might also be discharged over time by radio memory, ECU, remotes, etc.
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Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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