S.D. Codified Laws § 32-5-179
Any person who is a resident of this state and is the owner of a special interest motor vehicle may apply to the county treasurer of the applicant's county of residence for a special interest motor vehicle license plate. The application shall be on a form prescribed by the secretary and is in addition to any other forms required by this chapter. The applicant shall meet all of the requirements in § 32-5-182 and pay any applicable fees in order to receive a special interest motor vehicle license plate.
For purposes of §§ 32-5-179 to 32-5-183, inclusive, a special interest motor vehicle is a vehicle that is collected, preserved, restored, or maintained by the owner as a leisure pursuit and is not used for general or commercial transportation. The special interest motor vehicle license plate may be placed on any automobile, pickup, truck, or van licensed pursuant to § 32-5-6 that qualifies as a special interest motor vehicle.
SDCL 32-5-179