HI,
I would recommend the pair of golf cart batteries because they will hold a few quarts of water in each battery. While they will still need water, every 3 months is normally fine. It can take a 1/2 gallon of water when filling them. I use a plastic watering can.
I also have solar panels.
Actually I pretty much hate staying in crowded campgrounds, preferring a lake, mesa, or mountain overlook to camp at, usually for free. The 400 watt solar system would keep up with my power needs, and then some, including watching hours of TV nightly.
Good luck,
Fred.
