Like this guy:
https://www.solar-electric.com/trl111ah2dec.html
I can see cost being a factor ($353 x 6 yikes) and space required (says on that page that the 2-volt "fits in the space" of a 6 volt thus you'd need more space).
You're basically just getting the same number of cells: whether you're buying X amp hours of 12V batteries, 6V batteries, or 2V batteries its still just X amp hours (if you get them all rated at the same discharge rate).
I would think the advantage of 2V batteries would be easier replacement when a cell dies since each battery is a cell you are only replacing a single cell instead of multiples (e.g. if only 1 cell goes bad it is more cost effective to replace only that cell).
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