It all began when Heavy D opened up a diesel truck dealership with his pals, years before they became known as the Diesel Brothers. Like any modern business owner, he used the internet to advertise and, more specifically, Heavy D uploaded videos to YouTube and Facebook.

"You would never think that there are people solely dedicated to diesel pickups. But there are, and there are millions of them," he told 2KUTV in a May 2016 interview.

The videos became an almost immediate and surprising hit, which led to a life-changing call from Discovery. Next thing they knew, these four friends were turning their business and their relationships into a reality TV show.

Beyond the fact that watching them build these massively powerful vehicles is endlessly fascinating, it's their friendship that also keeps fans coming back. To refer to someone as your brother when they aren't related to you really means something. Plus, they have fun.

"I get to live the dream. I get to build trucks and drive around, do pranks and laugh at my friends," said Diesel Dave.

In their own lives, these bosom buddies have families of their own, but they always have each other's backs even when they are pulling some of the wickedest pranks on each other. "We just make it awesome," said Red Beard. Heck yeah, they do.