We wanted to be able to do a few days dry camping so I replaced the 12V group 24 batteries with 4 Interstate GC2s. That gives you 450 aH of reserve and was plenty to run the night inverter loads. I have 200 watts of solar and I'm thinking I need to double that, especially since solar panel prices are dropping.
I ran the genny in the morning for about 45 minutes to top the jars off and the solar kept them up all day. All these upgrades bought me 3 days minimum off grid and we can stretch that if we go Navy on the water usage.
Having the option of just pulling off the road and stopping for a couple of days changes the RVing experience completely.