Well I already have one 12 gallon Moeler tank from when I had my pontoon to go in the boat, and in thinking on another.

http://www.amazon.com/gp/aw/d/B004AP...QH5MY4H VH037

With the dual batteries, and full tanks that's a lot of weight to the aft, so I'm thinking on placing the batteries up front. Longer cables but whatever.
Should I tie the tanks together and draw from both at the same time for even weight distribution or use them separately?