The Mack Super-Liner is a class 8 heavy-duty truck that was introduced by Mack Trucks in 1977, to replace the Mack RW (R-Western) model. It was a development of the prototype Brockway Super-Liner, Brockway being a Mack subsidiary closed in early 1977. Its production lasted for fifteen years until it was discontinued in 1989. The model designation is RW.