Peterbilt Truck Company's EPA SmartWay certified Model 587, available with two sleepers or in a day cab configuration, sets the standard for operational efficiency, operator comfort and safety for on-highway Class 8 trucks, says the company. It features the new 2010 Paccar MX engine rated at 380-485 horsepower or the 2010 Cummins ISX15 available with a horsepower range of 400 to 600. Fuller manual and automatic transmissions are available with axle ratings up to 46,000 lbs. The 587 has features for improved overall visibility and forward lighting, increased maneuverability and better serviceability.