Grover supplies products for sporting goods, semi-trucks, marine, recreational vehicles and fire departments. The company manufactures air horns, compressors, solenoid valves, air tanks, bike racks, patio furniture and aluminum bats. Grover s air horns are produced for every United States heavy duty trucking manufacturer Ford, Freightliner, GMC, Kenworth, Mack, Peterbuilt, Volvo and Renault in...