I am not aware of any coming pre-installed in new RV's. Our 2021 Greyhawk came with a single 12v and the previous owner added a second, parallel 12v battery in the house bay.
My dream is to upgrade to a single 200 or 300 Ah LiFePO4 and throw a 200w solar panel on top for kicks. But unless they wind up in a stocking over our fireplace this December, that's just a dream.
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