[nwhouston]

Thanks for both replies. I am planning to go with the single 12 v deep cycle battery. My problem now is finding the right one. There are other threads on this site that say, "not marine", "should not have a CCA rating", and some other guidance that seems to indicate there really is a deep cycle, flooded lead acid battery out there for an RV trailer. So far I cannot find it. Whether Walmart or Interstate or other retailers, everyone seems to be selling deep cycle marine batteries for this duty.

Has anyone found a true deep cycle, low current - long use, 12 volt RV battery? Long use to me would be overnight in a Walmart lot with just the heater blower on (worst case). Otherwise we are always tied off to the Texas utility grid.

Thanks.

Larry