R.I. Gen. Laws § 31-25-11: Connections between coupled vehicles.

When one vehicle is towing another the drawbar or other connection shall be of sufficient strength to pull all weight towed by it and the drawbar or other connection shall not exceed fifteen feet (15′) from one vehicle to the other, except the connection between any two (2) vehicles transporting poles, pipe, machinery, or other objects of structural nature which cannot readily be dismembered. Violations of this section are subject to fines enumerated in § 31-41.1-4.