S.D. Admin. R. 70:03:01:61.02
A semitrailer or trailer may not be longer than nor weigh 3,000 pounds more than the trailer located immediately ahead of it. Rearward loading of a semitrailer or trailer is not allowed.
Lift axles and belly axles are not considered load carrying axles and will not count when determining the vehicle's weight limits. Axles which are spaced 8 feet or less apart must weigh within 500 pounds of each other.
The semitrailer or trailer hitch offset may not exceed 6 feet. The maximum effective rear trailer overhang may not exceed 35 percent of the wheelbase of the rear trailer. If the towbar between a truck-trailer combination exceeds 19 feet, it must be flagged during daylight hours and lighted at night. (See note at the end of this section regarding draw bar length.)
S.D. Admin. R. 70:03:01:61.02
General Authority: SDCL 32-22-42, 32-22-42.14.
Law Implemented: SDCL 32-22-42, 32-22-42.14.
Note: It is recommended that the draw bar length not exceed 8 feet.