The 1960 Pete has an overhauled engine, and air and electrical lines on the chassis have been replaced, too, according to the seller. It appears that this truck is the second of three used in the filming of the movie. It's a 1960 Peterbilt 281 made up to look like the 1956 model that was used for most of the scenes. Since that '56 was on its last legs, this truck was its double, and has also appeared in other productions, like a David Lee Roth video. We can't find out if there's a reserve, but it did just come out of a restoration, so it'll likely be well above the $20,000 range that normal 281s seem to trade for. Add in its matching vintage trailer and the movie provenance, which is purportedly documented, and this truck could well go for more money.
For a work vehicle, it's likely pulled its last real load a long time ago. Movie appearances tend to make people all kooky about a vehicle having some sort of added value just because it exists on a few million frames of release print somewhere. Either way, we've found both the movie's trailer and the full feature (they're embedded after the jump), where you can see the Peterbilt in action. Thanks for the tip, Greg.