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NH Trailer Laws Regulations New Hampshire Trailer Laws & Trailer Regulations

New Hampshire's laws and regulations for trailers are listed below:


New Hampshire Trailer Brake Laws

No motor vehicle trailer or semi-trailer shall be driven on the ways of this state unless equipped with adequate brakes in good working order and sufficient to control the said vehicle at all times. Does not apply to a motor vehicle trailer or semi-trailer with a gross weight of less than 3,000 pounds if the axle weight of the towed vehicle does not exceed 40 percent of the sum of the rated axle weights of the towing vehicle.

Every combination of motor vehicle with a trailer or semitrailer when driven upon the roadways of the state shall at a speed of 20 mph be capable, at all times and under all conditions, of stopping on a dry, smooth, approximately level pavement free from loose material, upon application of the foot or service brake, within a distance of 30 feet.



New Hampshire Trailer Dimension Laws

Total length: not specified; trailer length: 48 feet (includes bumpers); width: 102 inches; height: 13 feet 6 inches. 



New Hampshire Trailer Hitch and Signal Laws

Ball hitch shall be mounted on bumper or secured to frame; safety chain is required. 



New Hampshire Trailer Lighting Laws

The tail lamps and reflectors on trailers may be located at a height of less than 20 inches from the ground, provided they are placed in such a manner as to indicate the extreme width of the vehicle and load, and the visibility of reflectors is not impaired at any time.

It shall be unlawful for any person to pull any trailer unless it is equipped with a stop lamp in working order at all times.

It shall be unlawful for any person to pull a trailer registered in New Hampshire, which was manufactured after January 1, 1952, unless such a vehicle is equipped with directional signals.

Every trailer, when driven at night, shall have on the rear, 1 lamp, displaying a red light visible for a distance of at least 1000 feet, and a white light illuminating the registration plate of such vehicle so that the characters thereon shall be visible for a distance of at least 50 feet. All tail lamps shall be located at a height of not more than 72 inches nor less than 20 inches from the ground. On a combination of vehicles, only the taillamp on the rearmost vehicle need actually be seen from the distance specified.

Every trailer and semitrailer, with a weight of 3,000 lbs. or more, when driven on the roads at night, shall have displayed on the body or load carrying portion of the vehicle, the following: on each side, 1 amber reflector, located at or near the front, and 1 red reflector located at or near the rear. Such reflectors shall be located not less than 24 nor more than 48 inches from the ground. The visibility of any such reflector shall not be impaired at any time.



New Hampshire Trailer Mirror Laws

No person shall drive upon any road any motor vehicle so loaded that the driver is prevented from having a constantly free and unobstructed view of the road immediately in the rear, unless there is attached to the vehicle a mirror or reflector so placed and adjusted as to afford the driver a clear, reflected view of the road in the rear of the vehicle. 



New Hampshire Trailer Speed Limit Laws

No person shall operate any motor vehicle when towing a mobile home at a rate of speed in excess of 45 mph. 



New Hampshire Trailer Towing Laws

Every trailer or semitrailer, including farm and agricultural vehicles, shall have, in addition to the towbar or coupling device, a safety chain or cable to prevent breakaway from the towing vehicle. Each chain or cable shall have an ultimate strength at least equal to the gross weight of the trailer and the load being towed. Chains or cables shall be connected to the towed and towing vehicle to prevent the towbar from dropping to the ground in the event the towbar fails.

Except for duly registered wrecking vehicles and transporters or motor vehicles towing with a chain or cable for no more than 1 mile another vehicle which is disabled and unable to proceed under its own power, no motor vehicle shall be used to tow another vehicle on any road unless the 2 vehicles are connected by a tow bar of sufficient strength to control the movements of the vehicle being towed without manual steering of said towed vehicle.

No vehicle may tow on any road more than 1 vehicle, trailer, or semitrailer, except one used exclusively for agricultural purposes or authorized by the DMV to do so.

No person or persons shall occupy any type of house trailer or automobile utility trailer while it is towed. 




The United States Trailer Laws and Regulations by State by is not an inclusive list of laws, regulations and it should be used by reference only and not used for any other purpose. is not liable for incorrect or incomplete information. To report an error, incomplete or incorrect information, please send an email to





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