I probably use about 70 or 80 gallons a year. I bought a 35 gallon tank with hand crank pump through TSC and like it very much. I also have three Eagle 5 g Safety Cans, and a carrier basket to plug into the trailer receiver on my car, big enough to hold all three cans. Making two trips with the cans, to the filling station 1.5 miles down the road, nearly fills the tank -- and also keeps drips and spills outside of the car, so I don't stink it up! I have a shelf above the transfer tank onto which I can lift a 5 g can, and a shaker siphon to drop it into the tank.
This is probably too small a system to work well with you. But, still, it's way better than what I was doing before, trying to pour cans into the tractor with a funnel.