There's no such thing as a permanent tank installation. It's added and it can be subtracted. I bought my tank for my 02 and I traded that truck with the tank in it for the dually. A week later the salesman called that he had a buyer who didn't want the tank was I interested in it. Buyer came over I took it out and had it back and it cost me my labor and a like new HI-Lift jack that I'd bought at a garage sale for $!5. I had another tank I'd bought used and installed in another truck. I sold that truck after taking the tank out and putting it in my brothers truck