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I have had an RV of some sort since the early 2000's. Always multiple 12V deep cycles.
My toy hauler had a generator and an inboard charger, I would get about 5 years out of the batteries. More if I unhooked them and kept them in the garage on a tender over the winter. I always had the best luck with Interstate batteries from the local Interstate dealer. The secret is unhooking them if not using the RV, as there will be something that drains them. Unless you have solar.
My Super C has two 6v batteries, with solar, and a diesel generator. It is hard to make a comparison between the 6V and 12V because everything on the Super C runs off the batteries, whereas I could use propane for the old fridge etc.
When camping in the warmer weather and not using tank heaters (which draw a ton of power) the solar is enough to keep the batteries in good shape. During the winter months when I use it off grid I do need to run the generator some. There is room for 2 more 6V and I may upgrade to that.
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