This one-of-a-kind smoker and BBQ was built from a 1954 Willys Wagon. It was created as a portable bbq kitchen for a restaurant in Mississippi called the The Shed (actually, two restaurants now) founded by the Orrison family. They chose to use a Willys because, “it’s like the oft repeated mantra of cooking great barbecue: You have to drive it ‘low and slow.'”
Medium.com has a long story about The Shed and their experience at a BBQ competition.
Here are a few photos from medium.com and from USA Today: