S.D. Codified Laws § 10-47B-167
A licensed liquid petroleum gas vendor may sell liquefied petroleum gas exempt from the fuel tax imposed by this chapter, to a licensed liquid petroleum gas user or to a purchaser who owns a motor vehicle propelled by liquefied petroleum gas if the vendor delivers the gas into a bulk storage tank which has no liquid transfer line which could be used to deliver fuel into the fuel supply tank of a motor vehicle. The vendor shall certify that the vendor has inspected the bulk storage tank and that no liquid transfer line existed on the tank at the time of inspection. A purchaser shall obtain a propane user license before receiving liquefied petroleum gas into a bulk storage tank which has a liquid transfer line which could be used to deliver fuel into the fuel supply tank of a motor vehicle.
SDCL 10-47B-167