I Checked with a tank company in Southern Ca a couple weeks ago, they don't do custom tanks anymore and what they have won't fit to what we're looking for and pretty pricey, now here in the land of fruits and nuts if you should happen to have a tank built it will cost a small fortune all the correct epa fittings and signage and what not, makes building one cost prohibitive. What I did a few years ago was I had a steel shop roll the size that I wanted and cut out the ends, we called it a cylinder, then I had a local welding shop weld it together, I'm thinking of putting a split tank on the side of a roll back truck to have a 4'X 16" by 10 Ga cylinder rolled out and the ends cut was still in the 400$ range then still have to weld it up and put fittings. 16" X 30" is 25 gallons. The brackets for 16" tanks will cost 72$ each on top of that.
