Deadhead Miles actually came out in 1973:

http://www.imdb.com/title/tt0068452/

Our link:

http://imcdb.org/movie.php?id=68452

the main trucks year also needs to be switched from 1972 to 1973, as it is a '73 and bought new for the movie, plus the truck is up here in Maine today

http://imcdb.org/vehicle_101573-Peterbilt-359-1972.html