Class A - Any combination of vehicles with a gross vehicle weight rating (GVWR) of 26,001 pounds or more, provided the GVWR of the vehicle(s) being towed is in excess of 10,000 pounds.
Class B - Any single vehicle with a GVWR of 26,001 pounds or more, and any such vehicle towing a vehicle not in excess of 10,000 pounds.
Class C - Any single vehicle with a GVWR of less than 26,001 pounds or any such vehicle towing a vehicle with a GVWR not in excess of 10,000 pounds comprising:
"H" - Authorizes the driver to drive a vehicle transporting hazardous materials.
"K" - Restricts the driver to vehicles not equipped with airbrakes.
"T" - Authorizes driving double and triple trailers.
"P" - Authorizes driving vehicles carrying passengers.
"S" - Authorizes driving a school bus.
"N" - Authorizes driving tank vehicles.
"X" - Represents a combination of hazardous materials and tank vehicle endorsements.
Ala. Code § 32-6-49.10 (1975)