It is doubful there was an outstanding loan on a 20 year old truck.
Unless you're a real loser, ya pay cash for trucks that old. Hell I picked up an '86 Ford 1 ton dooly for $2500 bucks a coupla years ago. I needed sumpin to haul the 6 stall horse trailer around with. Had better than 200,000 on it, but hell a diesel, if you take care of 'em, will run forever. She's still doin' the job I bought her fer.
(ETA) How the hell do ya get a loan for a 20 year old truck anyways?