After the sudden death of his father, affable but clueless Tommy Callahan III finds himself thrust into the role of unlikely heir to the family’s struggling auto parts empire. To keep the business afloat, he hits the road with his dad’s uptight assistant, Richard, embarking on a wildly chaotic cross-country sales trip. As the oddball duo stumbles through mishaps and misadventures, they must not only learn to work together but also outwit a pair of scheming con artists determined to sell the company out from under them.