Interstate Companies provides a broad range of automotive products and services through its group of businesses. Its Interstate PowerSystems unit distributes engines, transmissions, heater systems, mobile refrigeration products, generators, and other products from manufacturers such as Detroit Diesel, DEUTZ, Dresser, Allison, and Carrier. Another division, AssemblySystems, offers parts, kits, and assemblies to bus and coach OEMs throughout North America. The BearingsSystems unit provides bearing, power transmission, and conveyor services. Founded in 1957, Interstate Companies has more than 20 locations throughout Northern Illinois, Iowa, Minnesota, the Dakotas, Nebraska, Wyoming, and Montana.