2021 Peterbilt 389, Cummins, X15, 565HP, Fuller 18 Speed Transmission, Sleeper, , , Stock # 1162933 Check out this used 2021 Peterbilt 389. Cummins 565HP X15, 18 speed manual transmission, 3.36 rears, low air leaf suspension, Dynasys APU, Platinum interior, SmartNav, Refrigerator, with a 78" Stand up sleeper with a single bunk and cabinet package.Trades welcome. Financing available with approved credit. Located 12 minutes from TUL International Airport, so distance is not a problem. Call Rush Truck Center Tulsa today to make sure this one is still available.