A few years back, Mack Defense, the defense-contracting arm of Mack Trucks, built several prototype M915 military-grade linehaul tractors (pictured), based on the OEM’s Granite chassis, to compete for a U.S. Army vehicle contract that never got off the ground.  Nonetheless, this advanced armored vehicle sure caught the eye of filmmakers, who adapted one to play the role of the nefarious “Megatron” in the third installment of the Transformers movie series. Charles ...

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