S.D. Codified Laws § 32-6B-5.3
A person who is a licensed dealer in another state may sell trailers at an event without a license issued under this chapter if the person meets the provisions of this section. Before selling any trailer, the person shall register and purchase a permit from the department. Before the department may issue a permit, the person shall provide proof the person is a licensed dealer in another state and has no outstanding dealer violations. The permit may only be issued if the trailer make being sold is not franchised in this state unless the person obtains a written waiver from any similar franchise dealer in this state. The person shall present the waiver to the department at the time the person applies for the permit. The fee for the permit is five hundred dollars. However, if the permit is purchased before the start of the event, the fee for the permit is two hundred fifty dollars. The permit is valid for fifteen consecutive days. Regardless of whether or not there is a franchise in this state, any person may display a trailer at an event. Any person found to be in violation of the provisions of this section shall be denied a permit for a period of fifteen months from the date of the violation.
SDCL 32-6B-5.3