2008 Peterbilt 388. 500HP Cummins ISX15. 18 Speed Transmission. Only 465,000 Original Miles. 40,000LB Full Locking Rears. 14,600 Steer Axle. Air Trac Suspension. Dual Line Wet Kit. Loaded Interior. Gauge Package. Air Slide Fifth Wheel. 11R24.5 Tires. Stainless Steel Rear Quarter Fenders. Engine Brake. Cruise Control. Dual Stacks. Dual Breathers. Clean Peterbilt 388