30 gallon Poly tank. I have two of them I use for this system. One is plain with no hoses. I put it in the back of the truck and fill it at the station. Then use a cheap, but fast siphon to gravity drain it into the tank on the dolly. Roll it onto my dock and then hook up a small air pump to the top of it as shown. With only about 1.5 psi of pressure it pumps the whole 30 gallons uphill into the boat in just over 3 minutes. My old crownlines fuel fill cap was at about dock height and I could just gravity feed the whole 30 gallons into the boat on it. Using this setup I never have to lift anything full of gas.

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