New batteries - maintaining charge while stored

[xz3kg7]

I just installed some new Interstate batteries in my 87FC35.

My last T105s lasted 3 years, which probably isn't bad, but not particularly
good either. I have the old "battery burners".

What is the best way to keep the batteries charged while the coach is not in
use? I never have quite figured out how my chargers work. there seem to be two
breakers relative to the charger(s). Also, I think in a compartment on the
drivers side there are one or two things plugged in that maybe be one or both of
the chargers/inverters..??

Is one breaker a charger and the other an inverter? If so, if one actually has a
plug on it I should be able to put a timer on it, right?

Thanks for any advice,
Alan Johnson
87FC35