[DutchmenSport]

We have 2 twelve volt batteries and can run our refrigerator when towing all day without depleting the battery, because the truck is sending a trickle charge to the battery. We have overnighted without shore electricity and the refrigerator did fine.

The longest we went with no shore power was 3 full days and night while we had a truck failure, mechanical repair, and it was in the shop and we stayed in a motel (long story). The camper was NOT located located anywhere near an electric hook-up. So I had to nurse the refrigerator for 3 full days to keep things frozen. I ran the inverter (and thus, the refrigerator) about an hour every 6 or 7 hours and we did not open the refrigerator unless it was absolutely necessary. The batteries did fine. When we had to move the camper (when we FINALLY got moved to a campground), there was still enough (umph) in the batteries to move the front landing jacks just fine.

So, if you switched over from 2 golf cart 6 volt batteries and go with 2 twelve both marine batteries, you'd definitely have longevity you didn't have before