2011 Peterbilt 388. 525HP Cummins ISX15. 18 Speed Transmission. 46,000LB Rears. 23,000LB Air Lift Axle. 14,600LB Steer Axle. Only 366,000 Original Miles. Air Trac Suspension. Double Framed. Loaded Interior. Leather Seats. Gauge Package. Air Slide Fifth Wheel. 11R24.5 Drives. 385/65R22.5 Steers. Engine Brake. Cruise Control. Dual Stacks. Dual Breathers. Clean Peterbilt 388