SDCL § 32-19-7: Permitted connection between towing and towed vehicle--Maximum length--Violation as misdemeanor.

The drawbar or other connection between any two vehicles, one of which is towing or drawing the other on a highway, shall be of sufficient strength to hold the weight of the towed vehicle on any grade where operated. The towed vehicle shall not whip, weave, or oscillate or fail to follow substantially in the course of the towing vehicle. Whenever such connection consists of a chain, rope, or cable the length of such connection shall not exceed fifteen feet. It is a Class 2 misdemeanor to violate the provisions of this section.