Lightning wakes up in the middle of the highway, and in a panic, tries to figure out what has happened. DJ, Boost, Snot Rod and Wingo mess with Mack as he dozes off, causing a trophy inside the trailer to fall down, releasing McQueen from the rear exit. Though Mack is nervous about the task, McQueen assures him that he will stay awake with him, though he falls asleep shortly after, leaving Mack alone and sleepy on the highway. Due to a bet McQueen made with Chick, he tells Mack to drive through the night. However, McQueen hates appearing in front of rusty cars, and desperately tries to sneak through the tent by hiding behind a cardboard cutout of himself, although the board falls over and the rusty cars crowd him.Д«oost and Wingo push Mack back and forth.ДЄfter leaving the speedway, Mack and McQueen travel the entire day to the Los Angeles International Speedway, where the tie-breaker race will be held. In Cars, when McQueen is making his way to Mack after the Dinoco 400 at the Motor Speedway of the South, he finds that Mack has parked his trailer at the back of his sponsor's tent, so that McQueen can easily exit after making a personal appearance. Mack reveals to McQueen that his trailer is parked in the sponsor tent. Mack and McQueen remained friends all the way through McQueen's rise to Piston Cup stardom.

However, McQueen agreed to take their offer as long as Mack was able to become his transporter. Upon meeting Rusty and Dusty Rust-eze, McQueen discovered that Rust-eze was a somewhat embarrasing mark to bear, making him initially hesitant to accept the job. Eager for a new sponsorship, McQueen accepted, and the two became fast friends on the journey there. Mack offered to bring McQueen to Boston to discuss the sponsor possibility.

When Mack happened to witness McQueen being dropped from his sponsor in favor of Sammy Smelter, Mack suggested Rust-eze, who had been looking for a new spokescar, while not finding success with their previous auditions.

During his spare time, Mack enjoyed watching races, with his favorite car being Smell Swell racer Lightning McQueen. Prior to becoming a racing hauler, Mack worked transporting Rust-eze products cross-country. Mack approaches McQueen outside Simpletown Speedway.

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