SDCL § 32-22-16: Maximum weight of vehicle or combination of vehicles--Axles--Misdemeanor.

No motor vehicle or combination of vehicles operating on a public highway may have a weight:

(1) In excess of twenty thousand pounds on any one axle, or in excess of the tire weight per inch of tire width prescribed by § 32-22-21, including all enforcement tolerances;

(2) In excess of thirty-four thousand pounds on any tandem axle, or in excess of the tire weight per inch of tire width prescribed by § 32-22-21, including all enforcement tolerances; or

(3) In excess of the maximum weight on two or more consecutive axles as determined by the formula detailed in § 32-22-16.1, or in excess of the tire weight per inch of tire width prescribed by § 32-22-21. However, in no instance may the gross weight of any vehicle or combination of vehicles exceed eighty thousand pounds on the interstate highway.

Two consecutive sets of tandem axles may carry a gross load of thirty-four thousand pounds each provided the overall distance between the first and last axles of such consecutive sets of tandem axles is thirty-six feet or more. A violation of this section is a Class 2 misdemeanor.