x2 on a pair of 6v GC2 (200 Ah) size batteries. This is what I use and we almost exclusively dry camp. I also have a 115W solar panel mounted on the roof.
I am still using the pair of GC2 wet cells I bought at Sears in 2009. They've weakened some but are still good enough for this year. I suspect this will be their last year in service though.
If you don't want to mess with having to worry about watering the batteries, get a pair of AGM cells instead. Make sure they're true deep cycle cells though - these are harder to find for AGM. (As mentioned, Lifeline and Trojan make them.)
