S.C. Code Ann. § 44-61-105
The governing body of any county may exempt, by ordinance, any ambulances used primarily as convalescent transport units from the size provisions of this article or a regulation relating to size requirements promulgated pursuant to this article.
(c) The minimum inside height from floor to ceiling is fifty-two inches.
4. (a) Rear doors shall swing clear of the opening to permit full access to the patient compartment.
(c) The spare tire shall be secured and stored in such a position that it may be removed without disturbing the patient.
5. (a) Lighting must be available for both the driver and an attendant, if riding in the driving compartment, to read maps, records, etc. There must be shielding of the driver's area from the lights in the patient compartment.
(b) Illumination must be sufficient throughout the compartment for adequate observation of vital signs, such as skin color and pupillary reflex, and for care in transit. Controls will be located in the patient compartment.
6. (a) There shall be at least one flood light mounted above the rear door of the vehicle.
(b) Convalescent transport units are prohibited from using emergency lights. Yellow warning lights may be installed, however, with use limited to emergencies that may develop while transporting convalescent patients.
7. All safety factors for the patient compartment detailed in Section 501 of Regulation 61-7 of the department shall be employed by convalescent transport.
8. All environmental equipment and specifications detailed in Section 501 of Regulation 61-7 of the department shall be employed by convalescent transport units with the exception that there need not be separate heating and air conditioning controls in the patient compartment unless a bulkhead or other physical boundary prevents adequate circulation.
9. A spare wheel with appropriate size, inflated, mounted tire shall be provided in addition to a jack and wheel lug wrench.
10. Convalescent transport units shall have storage cabinets of sufficient size and configuration to store all required equipment. All equipment must be accessible to the attendant at all times.
11. All convalescent transport units are prohibited the use of any siren or public address system.
12. All windows, windshield, and door glass must be shatterproof.
13. Convalescent transport units must be equipped with the minimum ambulance medical equipment detailed in Section 601 of Regulation 61-7 of the department.
14. There must be at least one certified Emergency Medical Technician in the patient compartment each time a patient is transported.
Nothing in this section shall be interpreted as prohibiting those ambulances meeting the requirements of federal specification KKK-1822 from operating as both convalescent and emergency vehicles.
Any vehicle which does not meet the size requirements named in federal specification KKK-A-1822 may be used as a convalescent transport unit provided it meets the following requirements:
1. There shall be no restrictions concerning the painted color of convalescent transport units.
2. No emblems or markings detailed in Section 501 of Regulation 61-7 of the department may be employed by convalescent transport units, except that the name of the operating company or organization shall be allowed on the vehicle.
3. (a) The minimum inside length from the back of the driver's seat to the closed rear door of the vehicle is one hundred eight inches.