I like what you all have done with the trailers - particularly helpful if you don't have far to go to refill them!
I have a 275 gallon fuel oil tank that I took out of a home and it is my designated off-road fuel tank. I have a hand pump and the tank is in a small building that has an access door at the pump level. It provides diesel for my B7800, ZD1211 and X1100C. For the 10+ years I have used this arrangement I've not had a problem with water or bad fuel. I use about 200 gallons per year and due to the large volume I can usually purchase when the price seems as low as it will go. I always order the delivery after the winter blend is in stock.