Charging batteries with a small generator

Is there any way you can get a gas refrig installed? Seems like that would make everything easier. You should be able to camp for days on one battery with a gas refrig.

Speaking of which - what about heating the camper? If you have an onboard forced air gas heater, the blower can use more power than you might think. If you have an electric heater - your battery may not last the night.