Truett Cathy, the founder and chairman of Chick-fil-A, raised the door on a steel-sided barn and shuffled outside, revealing a massive red fire truck parked in the driveway. This 1915 Ford Fire Car is part of Truett Cathy’s collection of more than 70 vintage cars and trucks. “Crank it up,” he told one of his assistants, creating a whirring, blaring scene of lights and sirens on this farm south of Atlanta.