Ottawa Truck Corporation, a Kansas-based manufacturer of terminal/port tractors, was purchased by Oy Sisu Auto Ab (“Sisu”).   Sisu designs, manufactures, sells and services heavy-duty, factory-ready, multi-axle special trucks.  It offers rock gravel, road maintenance, crane, carrier equipment transport and roll demountable body trucks and timber trucks for transporting logs.  The company also provides armored off-road trucks and special vehicles for military use.  Sisu acquired Ottawa Truck Corporation to strengthen its terminal tractor market share.  Sisu is based in Karis, Finland.