Make: Peterbilt Year: 2015 VIN Number: 294107 Condition: New Unit 45326 (174688) shown by iSellPro, for sale by Peterbilt of Sioux City - Fully loaded 579. Platinum interior, navigation, fridge, espar, heated mirrors, and so on 2015 PETERBILT 579 TANDEM AXLE SLEEPER FOR SALE IN IOWA:: - PETERBILT 579 for Sale Engine: PACCAR MX 500 HP Transmission: 18 Spd. Axles: Tandem Suspension: Pete Flex Air Rear Ratio: 3.25.