What is mack in cars?

Mack is a freight truck brand that appears in the animated movie "Cars". The Mack truck is voiced by actor John Ratzenberger and is the character Lightning McQueen's transport vehicle and his best friend. Mack is a hard-working truck who is loyal, dependable and supportive of Lightning throughout his career in racing. He is often seen taking care of Lightning, making sure he gets to his races on time and that he is well-rested. Mack is known for his distinctive blue and silver color combination and his attached trailer which is always stocked with Lightning's race gear.