Thank you all. The pictures really help. I chose 31's because the Tohatsu manual calls for 110ah "in cold locations". My design trip was Seward to Homer, now Sitka to Pelican, so the bank size I'm fine with. They are sitting in the entry now, and they aren't bantams;-) ; I am mentally constructing a seat/cabinet around them. As I have thought about weight distribution I am balancing the kicker (transom port) with the batteries (pilothouse/starboard). Like many, I want the battery weight in the mid-ship, not stern.