I have an all electric B that I bought 2 years ago and still sorting out the occasional time that I don't have electric hookup. Haven't tried to push how long the compressor refrigerator will go on my one battery, I intend to add a second but I think that still will only get me about a day. When I know I am going to be off grid I carry a small 1000W inverter generator to recharge as needed.
I solved the cooking problem with a small Butane stove, doesn't take up much room and I carry a few extra cylinders. The one I bought below, can also be used with propane and I cary the adapter but no cylinders, I can buy them anywhere if I run low on Butane.
https://www.amazon.com/gp/product/B01LW87Z9O/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1