[THEFERMANATOR]

I've got just what you need. It's a rubber 60 gallon bladder tank. You open it up, fill it with fuel, and close it up. You hook up a pump to it and fill your main tank from it as needed, and when your done with it you fold it back up and stow it away. It has no vents or anything as it is a solid air tight bladder with a tight fitting cap. My dad used it for extending his range way back in the 70's so he could get out to the middle grounds. They were used heavily back in the 60's and 70's for aircraft making long trips so you could carry extra fuel, but put the weight where you needed it at.