Here is why I went 2 12 volt......

1-can jump my starter battery if I have to
2-something happens to one of the trollers, can use the starter battery(once I get one)
3-or I can use a cheap lead acid to get me by for a day or two (now somebody gonna say you can't do that. The company I bought them from says no problem short term)
4-waking the 36 volt should you run it down(can it happen,yes, will it happen, maybe not)
5-like Rickie, I have plenty of space

When I bought mine, I don't think Bill was in business. Had he been, I probably would have went with Impulse cause he's about 45 minutes from me.