Curtis Dorwart, Mack Trucks Vocational Product Manager, talks about some of Mack's other products on display at WasteExpo 2015: The MP7 and MP8 engines; the 150/151 carriers; the EX Plus air disc brakes; and a new product, the mDRIVE™ HD (heavy duty) transmission. That new offering is a 12-speed, fully automated transmission just recently debuted. He also details that the gold bulldog signifies a pedigree power train.