388, Heavy Duty Trucks - Cab and Chassis Trucks, Cummins ISX, 18 Spd, U10539 is a 2014 Peterbilt 388 originally from Texas and has larger than life specs to match. This Work Ready heavy duty truck with less than 100,000 miles has a ton of possibilities. 2014 Peterbilt 388 Cab and Chassis Quick Specs: Heavy Front and Rear End Double Frame Rear Lockers Tons of Frame 600 Horsepower 17 Gauges Sliding Rear Window, 600 Horse Power, HaulMaax Suspension, Aluminum Wheels, 285 Wheel Base, , Tandem Axle, Ratio,