Designed and built with an emphasis on heavy-duty.the arrow XT meets the demands of any high volume department with its rugged and dependable chassis and an all business cab interior. Chassis Arrow XT™ Engine Detroit Diesel DD13, Cummins X15, ISX 12 or L9 Engine Horsepower 370 - 600 hp Transmission Allison 3000 EVS, 4000 EVS, or 4500 EVS Front Axle Suspension Leaf or TAK-4® Independent Front Suspension Rear Axle Suspension Leaf, Rubber, or Air; Single or Tandem Cab Roof Style Flat or Raised (10", 16" or 20") Doors Barrier or Full Height Electrical System Hard Wired or Command Zone™