This endorsement is required to haul any liquid or gaseous materials in a tank or tanks having a capacity of 1,000 gallons or more that is either permanently or temporarily attached to the vehicle or chassis. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. Each question has three or four possible answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Arkansas Commercial Driver License Manual. Questions come from chapters covering: Safety, Air Brakes, Combination Vehicles, Tank Vehicles and Doubles and Triples. The Tank endorsement can be used with the Class A, B or C CDL.