S.D. Codified Laws § 32-3-3.1
Any new mobile home, new manufactured home, or mobile home or manufactured home which has not been registered in this state shall, upon its sale, be initially registered and titled pursuant to this chapter, and the initial registration fee provided in § 32-5-16.1 shall be collected. If the mobile home or manufactured home is sold by a dealer, the licensed dealer shall deliver to the county treasurer the manufacturer's statement of origin, the manufacturer's certificate of origin, or the title for the mobile home or manufactured home, together with the required fees and completed forms necessary to accomplish the initial registration within forty-five days of the sale. For mobile homes or manufactured homes not sold by a licensed dealer, the purchaser shall register and title the mobile home or manufactured home within forty-five days. Any dealer or purchaser who does not comply with this section is subject to a late penalty fee of one dollar for each week or fraction of the week beyond the forty-five day limitation for twenty-five weeks and a late fee of fifty dollars for twenty-six weeks or more. Any person applying for title a year or more beyond the forty-five day limitation is guilty of a Class 2 misdemeanor.
SDCL 32-3-3.1