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.
and Zoe the Wonder Dog(R.I.P.)
'07 Roo 23SS pushing an '07 Chevy Avalanche
Equalizer WDH and Prodigy BC