Dan,
You lost me on the "2/0 in either 12 or 6 VDC" thing.

I guess I wasn't thinking "redundancy" but "reliability" on this. It seems like if you get some rust on a grounding point over time it shorts out. If it were all in one place (right behind the batter on the firewall) it would be easier to maintain.

I'm over thinking this aren't I? I do that a lot. That's how I drift off to sleep at night...how can I make this more difficult? Ha, ha!