UPDATE: Thanks again for all these replies. I still have so much to learn and your experiences are extremely helpful. I am sorry part of my post was unclear...I have the RV stored in an storage facility without electricity. The house battery "cables" are currently connected but the disconnect switch on the RV is in the OFF position.
The chassis battery was still good (at least for now) so I had it charged and re-installed it leaving the negative cable off for now. I think I will invest in a good solar maintainer.
Still plan to take her for a little spin every month or so if nothing more than to lube her joints, exercise the generator, and change the position of the tires.
I'm leaning toward removing the house batteries during non-use and keeping them at my house with a smart charger...any recommendations for a charger (preferably one that can charge more than one battery, if such an animal exists)?
Thanks.