It is easy, scary easy, lol. I went the first time with a 5 gallon can to McCall Air/Aviation. The yellowish building on the corner of 55 and Deinhard. He took me back to the tank, showed me how to use it, and gave me a code for the auto gate. I have been back twice with my trailer and 55 gallon drum to refill. Last time the gate wasn't even closed, I just drove out onto the tarmac, filled up, drove out. A little strange, but small town ways I guess, lol. It takes a credit card at the pump, so I suppose it would work 24/7.
Chris