The name of the company on the door of Burt Young's truck is "Paulie Hauling." "Paulie" is the name of Young's popular character in Rocky (1976).
Director Sam Peckinpah allowed actor and long-time associate 'Coburn, James' to work on the movie as a second-unit director to get his DGA card, and rumour has it that Coburn actually directed some scenes when Peckinpah was "unwell."
The Mack truck in the shootout scene on the Bridge was actually damaged so badly that it broke down just moments before filming the scene and had to be pushed across the bridge by a bulldozer to complete the scene.
In Bill L. Norton's second draft of the screenplay dated January 1977 the trucker stadium funeral takes place at the beginning instead of the end.
Director Cameo: [Sam Peckinpah] a sound engineer aboard a mobile unit, wearing his trademark mirror sunglasses.
Although the movie was inspired by the 1976 song of the same title, the song really didn't have much of a plot. So after the screenplay was written, Bill Fries (aka CW McCall) recorded a new version of the song, with lyrics that incorporated the characters and events of the film. This is the version that is played during the final credits.
The song had been written by Bill Fries in 1974 for a series of bread commercials and the result was a popular trend with CB radios and trucker lingo. By the time the movie went into production in 1977, the trend had already faded but that didn't stop it from being a box office hit.
According to the audio commentary on 42nd Street Forever Volume 4, Gene Hackman turned down directing the film.
The duck on the hood on Rubber Duck's Mack truck was later used in Quentin Tarantino's "Death Proof" as the hood ornament on Kurt Russell's hotrod. It was created by John R. Billings.
The four leading actors all appeared in previous Sam Peckinpah films. 'Kris Kristofferson' ("Pat Garrett and Billy the Kid", "Bring Me the Head of Alfredo Garcia"); Ali MacGraw ("The Getaway"); Ernest Borgnine ("The Wild Bunch"); Burt Young ("The Killer Elite").