What about ~60V of lithium? You'd lose weight, gain cargo space and range, and you'd have much less voltage sag than lead under high load and as SoC falls. Downside is you'd need to build a BMS and a charger, and depending on how many KWh you need, it might not be exactly cheap.
Counting the number of up versus down arrows in your post, it looks like you'd favor the 192V setup!
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