2016 MACK, PINNACLE CHU613, Heavy Duty Trucks - Sleeper Trucks, MACK MP8, Manual, HEAVY SPEC!!!! 2016 Mack CHU613 FLAT-TOP MP8-505HP & 13 speed manual transmission. HEADACHE RACK & TWIN STACK!!!!! 14,600 pounds, and rear axle holds 44,000 pounds., 505 Horse Power, Air Ride Suspension, Aluminum Wheels, 249 Wheel Base, 11R24.5, Axle, 4.19 Ratio, Flat Top Sleeper, VIN 1M1AN07Y6GM024789