That's a pretty awesome setup you've got going on there!
A super cap is essentially a battery. I liked using the hc600's because they're small and not crazy expensive. I'd tie 4, 8 or more together depending on the build. I'd build a rack to hold them side by side behind a rear seat or whatever and save space. Limitless options.
In your case one or two would make a difference but you'd have to run good cable to it.
If I remember right a hc600 or 800 is equivalent to like 100 1 farad caps just to give you an idea.
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