Winter Storage Question

Thanks for all the ideas, folks. If we stayed in the area (we winter in FL), I would simply go start it up every once in a while. Or I would go out there and plug it in overnight every so often (the storage facility owner has said he'll allow me to do that). But we won't be around to do that. Which is why I've thought about getting a solar charger with a brain. I don't at all mind taking the chassis batteries out for the winter. They are two monster batteries, but not so difficult that I'm unwilling to yank them. I don't, however, want to remove all four house batteries. But if I understand deep cycle house batteries right, as long as I store them fully charged, they should be good to go after 3-4 months in these moderate winter temps? Average lows even in January here are above 30..