I actually bought one from tractor supply. I've put 75#'s of air in it and with the tire off of the ground( so I'm not working against the weight of my truck) I can usually get two tires done. I think I paid $43.00
I was working with the weight of the vehicle on the flat. Mine in 20" x 9". The sticker is off it that says the gallons. It's 15 years old from Harbor Freight. Don't know if they are the same size still.
