Fuel Tank Shape?

[BA17]

I guess I am going to go ahead and replace my fuel tanks. Not sure the 96 gallon tank will fit when moved forward. Trying now to decide what to go with. I am going to put two tanks back in somewhere around 130-140 gallons and jam them both all the way to the front bulk head. I see most guys going with rectangular tanks, has anyone put the v-shaped belly tanks up front? If you have, how did you do your tank step for the tank to sit on?