RSA 265:108 Certain Towing Prohibited.

I. Except as otherwise provided in this section, no vehicle, truck-tractor, or tractor may tow on any way more than one vehicle, truck-tractor, trailer or semi-trailer, except one used exclusively for agricultural purposes. This provision shall not apply to:
(a) Towing by duly authorized wrecking vehicles.
(b) Transportation of new and used trucks in saddlemount combinations, provided no more than 3 saddlemounts may be used in any combination, and provided that all vehicles comply with the regulations of the federal Bureau of Motor Carrier Safety regarding driveaway-towaway operations as provided in title 49 of the Code of Federal Regulations, part 393.71.
(c) Commercial vehicle combinations consisting of a truck-tractor, semi-trailer and not more than one full tra