2021 Peterbilt 579, Cummins, X15, 400HP, Fuller 12 Speed Transmission, Sleeper, , , Stock # 1161252 2021 Peterbilt 579, Cummins, X15, 400HP, Fuller 12 Speed Transmission, Sleeper, , , Stock # 1161252 Come in today to see this 2021 Peterbilt 579 with an APU. Financing available!!!