I replaced the OEM no name batteries in my new Axis with Group 31 AGMs, mostly for more capacity but also no maintenance issues. They were $200 WindyNations from Amazon.
As others have said, lithium batteries are a bit of a cult thing but also give more usable amp hours for dry camping and faster charging (but only if you upgrade the converter). You can put two G31s in the under the step space and get 180 Ahs usable vs 75 Ahs usable with the OEMs or 100 Ahs usable with G31 AGMs. Golf cart batteries which are a great low cost solution will not fit under the steps.
And there is nothing wrong with AGMs. Thor customer service is flat wrong about that.
David
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