389, Heavy Duty Trucks - Conventional Trucks w/ Sleeper, Cummins ISX15, 18 Spd, HEAVY HAUL SPECS!! Want to build your own custom truck? You can with this truck as we have $8,000 built in for you to add any customization's you want!, 550 Horse Power, Pete Low Air Leaf Suspension, Wheels, 295 Wheel Base, , Tandem Axle, Ratio, 78 Ultracab Unibilt