Vermont trailer laws and regulations
Vermont trailer rules at a glance: registration, fire extinguisher rule on trailer coaches, brake thresholds, length, width, height limits, and hitch rules.
Vermont requires every trailer to be registered and titled before driving on public highways. Trailers over 3,000 lbs need brakes on at least one axle. Combined length is 75 ft, max width is 102 inches, max height is 13 ft 6 in, and trailer coaches must carry a fire extinguisher approved by the state fire marshal.
Quick reference
| Rule | Vermont limit |
|---|---|
| Registration and title | Required for all trailers on public roads |
| Max combined length (tow + trailer) | 75 ft including bumpers |
| Max trailer length | Not specified |
| Max trailer width | 102 in |
| Max height (trailer + load) | 13 ft 6 in |
| Trailer brakes (under 3,000 lbs) | Not required if wheel weight ≤ 40% of tow vehicle |
| Trailer brakes (3,000 to 6,000 lbs) | Required on at least one axle |
| Trailer brakes (over 6,000 lbs) | Required, adequate to control vehicle |
| Breakaway brakes | Must hold for at least 15 minutes after separation |
| Fire extinguisher (trailer coaches) | Required, state-approved, accessible |
| Riding in trailer while moving | Prohibited |
| Safety chain | Required on every trailer coach |
Source: Vermont Statutes Title 23 (Motor Vehicles), administered by the Vermont DMV.
Registration
Vermont law prohibits operating a motor vehicle or drawing a trailer on any highway unless it is registered. Trailer registration fees are based on the trailer’s loaded weight rating. A title is also required before the trailer can be driven on public roads.
Dimensions
- Max combined length (vehicle plus trailer, with bumpers): 75 ft.
- Max trailer length: not specified at the state level. The 75 ft combined cap applies.
- Max trailer width: 102 in.
- Max trailer height including load: 13 ft 6 in.
Loads over these limits need an oversize permit from VTrans.
It is illegal to ride inside a house trailer or trailer coach while it is being towed.
Trailer coach fire extinguisher rule
Vermont is unusual in this respect: every trailer coach must carry at least one fire extinguisher that has been approved by a Vermont fire marshal. The extinguisher must be in good working order and easily accessible in an emergency.
A standard 2A:10B:C-rated extinguisher meets the spirit of the rule. Check the date stamp annually and replace expired units.
Hitch and safety chains
A motor vehicle towing a trailer coach must use a safety chain at all times while on the highway, in addition to the primary hitch or coupler. The primary hitch must also be strong enough to handle the loads without risk of failure.
For non-coach trailers (utility, boat, etc.), Vermont follows the general principle that the connection must be strong enough for the load and that a secondary safety connection is good practice even when not explicitly required.
Lighting
The basic Vermont trailer lighting requirements:
- All trailers need tail lights.
- At least one brake light.
- A license plate light.
- Trailer coaches manufactured after 1955 need turn signals.
- All trailers need reflectors.
If you tow with a Ford built 2021 to 2026 (F-150, Super Duty, Ranger, Expedition, Maverick, Transit, Lincoln Navigator), check recall 26C10 (NHTSA 26V104000). Ford issued an OTA fix in March 2026 for an Integrated Trailer Module software fault that affects trailer lighting.
Speed limits
No special trailer speed limit. Posted limits apply. State troopers can stop you for unsafe operation regardless of speed.
Mirrors
Vermont requires mirrors that reflect an unobstructed view of the road behind the vehicle. The state does not specify a distance, but most enforcement references the 200 ft rear visibility standard common in other states. If the trailer blocks the interior mirror, side mirrors that achieve adequate rear view are required.
Brakes
Vermont brake thresholds:
- Trailers under 3,000 lbs do not need brakes as long as the trailer’s wheel weight does not exceed 40% of the tow vehicle’s gross weight when connected.
- Trailers, semi trailers, and trailer coaches between 3,000 and 6,000 lbs must have brakes on at least one axle. The driver must be able to apply the brakes from the cab. If the trailer accidentally breaks away, the trailer brakes must engage automatically and stay engaged for at least 15 minutes.
- Trailers, semi trailers, and trailer coaches over 6,000 lbs operating on state highways must have brakes adequate to control and stop the vehicle.
The 15-minute breakaway hold rule is stricter than most states. Make sure your breakaway battery is charged and the switch and brakes are tested annually. A flat breakaway battery on inspection day in Vermont is a quick way to fail.
For tow setups: an electric brake controller (Tekonsha, Redarc, Curt) in the tow vehicle plus electric or electric-over-hydraulic brakes on the trailer covers most Vermont towing.