S.D. Codified Laws § 62-3-16
The provisions of this title, not inconsistent with the provisions of this section, apply to the business of operating threshing machines, grain combines, corn shellers, cornhuskers, shredders, silage cutters, and seed hullers for profit, but do not apply to the operation of any thereof by the owner thereof for the threshing, combining, corn shelling, cornhusking, shredding, silage cutting, or seed hulling of the owner's grain crops, nor to any operations in the nature of exchange of work between farmers, nor to persons who are not generally engaged in the operation of such machines for commercial purposes. Before any person engaging in such business, and being under the provisions of this title, shall operate any such machine, the person shall secure liability under this title as provided in §§ 62-5-1 to 62-5-5, inclusive. Any contract by any such person for threshing or combining of any grain, corn shelling, cornhusking, shredding, silage cutting, and seed hulling by machinery without first having procured and filed such policy or such certificate, is null and void, and no compensation is recoverable under the contract.
SDCL 62-3-16