S.C. Code § 56-3-2900
Upon request the Department of Motor Vehicles shall provide temporary license plates and registration cards designed by the department to manufacturers in South Carolina who produce trailers or semi-trailers and who apply for these plates and cards. The fee for each set of license plates and registration cards is twenty dollars. Applications for these license plates and registration cards must be made to the department on forms prescribed and furnished by the department. The department shall issue temporary license plates and registration cards in blocks of up to one hundred per application. When a block of temporary license plates and registration cards is issued, the fee is equal to the number of sets of temporary license plates and registration cards in the block multiplied by twenty dollars. A manufacturer may issue a temporary license plate to a trailer or semi-trailer that is being moved from the manufacturer to the dealer's or purchaser's place of business.
S.C. Code § 56-3-2900