587, Heavy Duty Trucks - Conventional Trucks w/o Sleeper, Cummins ISX15, Ultrashift, (2) Matching 2016 Peterbilt model 587 daycab tractors. Cummins powered 525HP, Ultrashift Plus 13 Speed automatic transmission, all aluminum wheels, single exhaust. Call today for more information and pricing!, 525 Horse Power, Low Air Suspension, Wheels, 199 Wheel Base, 11R22.5, Tandem Axle, Ratio,