S.D. Codified Laws § 32-12A-21 (2026)
The holder of a valid commercial learner's permit or commercial driver license may drive any vehicle in the class for which that license is issued, and any lesser class of vehicle, except a motorcycle. No person may drive a vehicle requiring an endorsement unless the proper corresponding endorsement appears on that person's commercial learner's permit or commercial driver license. A commercial learner's permit or commercial driver license may be issued with the following classifications:
(1) Class A Combination Vehicle. Any combination of commercial motor vehicles and towed vehicles with a gross vehicle weight rating of twenty-six thousand one or more pounds if the gross vehicle weight rating of the vehicles being towed are in excess of ten thousand pounds. This class includes:
(2) Class B Heavy Straight Vehicle. Any single commercial motor vehicle with a gross vehicle weight rating of twenty-six thousand one or more pounds or any such commercial motor vehicle towing a vehicle with a gross weight rating not exceeding ten thousand pounds. This class includes:
Source: SL 1989, ch 267 , § 16; SL 1991, ch 252 , § 9; SL 1994, ch 254 , § 2; SDCL § 32-12-96; SL 2001, ch 171 , §§ 88, 115; SL 2007, ch 182 , § 7; SL 2010, ch 161 , § 6; SL 2011, ch 144 , § 6; SL 2015, ch 168 , § 18.