i've had two 12v deep cycle batteries on my Roo, for 7 years and have never had to take the batteries off, because i installed a battery cutoff switch.
all i do, when i'm getting prepared to go, is that i turn off the cutoff switch and hook up the shore cord to home power.
my batteries, during 4 months of winter storage, have never gone below 75% because of the cutoff switch.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity