Dustin Hoffman and Dax Shepard ("Without a Paddle") are in negotiations to star in Warner Bros.’ "Car Wars," according to The Hollywood Reporter. Hoffman will play a Mercedes-Benz dealer whose business goes downhill after a rival car dealership opens across the street. Dustin Hoffman can currently be seen in David O’Russell‘s "I Heart Huckabees" and Dax Shepard is filming the forthcoming "Zathura."