Before you invest all that money in a trailer, I would talk to John Hooker in the hangar just south of the fuel pump. I don't think they will take kindly to someone driving up to the pump and sucking out 1,000 gallons. It is a municipal airport and they provide the rock bottom fuel price in an effort to keep air traffic up. Providing fuel at no markup with nothing in return isn't going to set well with the city council.
For all I know they might be good with it, but it would be a lot of money invested for naught if you couldn't buy the fuel that way or caused their fuel price to go up.
Thinking about someone driving up and buying mass quantities of local cut rate fuel brings to mind the soda machine where I worked while in high school. I worked part time in an auto supply store while in high school ca. 1967. The owner had a nickel vending machine while the standard price everywhere else was a dime. The owner lost money on every bottle and even more when the empty bottle wasn't returned. He was fine with it, because it was a courtesy for his customers and employees.
The ladies at the beauty shop next door found out about the cheap price and started stepping in and buying sodas, thinking they had found a bargain. Then they started telling their customers to come over and buy them. We started politely telling them that we lost money on them as a courtesy for OUR customers, but the message didn't take.
We resorted to unplugging the machine and telling them that it was broken, but they checked every day to see if it was fixed. After they gave up, we plugged it back in, but in a few days they found out it was working and were afraid it would break again, so they brought their cases of empty bottles and would empty the machine. That was the last straw. The owner went to a dime machine.
Wherever there is a cut rate price for something, there is a business reason for the price. If the model that is used for justifying the price is disrupted, it might do away with the price. I would investigate before making the investment in a trailer.