32-18-1.2. Fertilizer and agricultural chemical trailers exempt--Exception for new vehicles.Any vehicle designed and used primarily for the distribution and application of agricultural fertilizer or chemicals, when drawn by another vehicle shall be exempt from the provisions of this chapter. However, vehicles with a gross vehicle weight of over twenty thousand pounds manufactured after July 1, 1979, shall have brakes acting on all wheels. Source: SL 1979, ch 223, §4.
South Dakota Legal Code