Founded in 1976, Williams Tank Lines is one of the largest bulk petroleum carriers in California. It provides a range of transportation services for petroleum products. The company operates more than 100 units in California and Nevada. Williams Tank Lines also specializes in dispatch and billing operations. It offers 24-hour delivery services and maintains a fleet of vehicles to transport bulk products throughout the western United States. The company serves over 300 customers, including independent jobbers and oil companies. Williams Tank Lines has tractors from Peterbuilt and Freightliners makes. In addition, it operates employment and inventory departments and sells various equipment.