1 battery is better than 2 and 2 is better than 4 etc... from a technical perspective think of minimizing series and parallel cells required to provide X capacity and voltage for an optimal storage design. The 6V golf cart batteries have historically been a great compromise based on cost. It was the cheapest way to get the best cell storage per $ and typical capacity/use time in RV like situations. Still possibly true for some uses or views today even if simply based on local availability. However the apples to apples battery cells for 12V cost difference gap has become much more competitive making the 6V GC battery argument/belief have less validity these days. Now days about the only remaining argument is that 6V batteries are half the weight of the same cells in 12V, so individually they are easier to handle.
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Axis 24.2 "was" tug'n a JK
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