I have Three Diesel Tractors on a 15 acre lot and picked up a 55 Gallon Enduraplas DEF unit. It is fantastic as it has a pump built into the container that you attach to your battery of what ever you are re-fuelling. I like this size as I typically grab a couple of my Diesel jerry cans and dump it into this container to keep it topped up. No need to get a truck in to deliver. Ensures the fuel is fresh and I put it on a dolly so I can wheel it around in the shop for easy mobility. Would highly recommend this for a small farm or hobby farm.