Great West Casualty Company is a property and casualty insurance company that specializes in truck insurance. The company was founded in 1956 and is headquartered in Sioux City, Iowa. Great West Casualty Company provides insurance coverage for trucking companies, including liability, physical damage, and cargo coverage. The company also offers risk management services, such as safety training and loss prevention programs. Great West Casualty Company is a subsidiary of Old Republic International Corporation, a Chicago-based insurance holding company.