I can go 3 cccc-cold nights with two 12v batteries. in the spring /summer. i can go 6days(just wife and I) without having to run the genny. I swapped all of lights to LED, installed a kill switch for the radio, (huge parasitic load - display and such) and I switch off the tongue jack and stabilizing jacks. If i've got the kids, i can go 3 days...
I picked up another set of 12v batteries from costco, and when home... I charge them off the rig with a Black and Decker VEC1093DBD. When i am dry camping I have two banks of batteries. I just put them on a 4x4 frame to get them off the ground. We are good then. It's sooo nice to not have to run the generator. I am gonna eventually invest in a solar system.