Louisiana trailer laws and regulations

Louisiana requires brakes on trailers over 3,000 lb, operable from the tow vehicle cab. Trailers built after 1962 need brakes on all wheels; trailers 3,001 to 5,000 lb may have brakes on a single axle only. Trailers under 15 ft with no brakes are speed-capped at 45 mph; trailers 15 to 32 ft with brakes are 50 mph day / 55 mph night. Max trailer length 40 ft, total combination 70 ft, width 96 in, height 13 ft 6 in. Safety chains required on trailers under 6,000 lb. Connection length capped at 15 ft.

Quick reference

Registration and trailer classifications

Louisiana law (La. R.S. 32:9, 32:51) requires registration of any trailer used on public roads. The class of license plate depends on the trailer type:

• Light trailer: under 500 lb fully loaded.
• Semi-trailer: no motive power, designed to carry property or passengers, part of weight carried by the tow vehicle.
• Trailer: no motive power, designed to carry property or passengers, two or more axles, no weight carried by the tow vehicle.
• Boat trailer: non-commercial, designed for hauling pleasure watercraft, generally under 1,500 lb loaded.
• Farm trailer: owned by farmers for farm hauling tasks.
• Mobile home: stationary as housing, transportable on highways.
• Travel trailer (camper): temporary habitation, hitched for transport between sites.

Each category has its own registration fee and plate type. Contact OMV (Office of Motor Vehicles) for current rates.

General towing laws

La. R.S. 32:382 covers connection rules:

• Connection between two vehicles must be strong enough for the trailer’s loaded weight.
• Connection length cannot exceed 15 ft. This is shorter than Iowa’s 21 ft allowance and standard for most southern states.
• Rope, chain, or cable connections (for emergency tow scenarios) need either a 12 in red flag during daylight or a red light visible 500 ft at night attached to the connection.
• Maximum two trailers behind a passenger vehicle.
• No riding in a trailer while it’s being towed on public roads.

Brake requirements

La. R.S. 32:344 sets the brake rules:

• Trailers and semi-trailers over 3,000 lb gross weight must have brakes adequate to control, stop, and hold the vehicle. Brakes must be operable from the tow vehicle cab.
• Trailers built after 1962 must have brakes on all wheels (when brakes are required).
• Trailers rated 3,001 to 5,000 lb may have brakes on one axle only (a narrower exception within the rule).

Louisiana does not separately mandate breakaway brakes in the basic statute, though federal regulation effectively requires them for trailers over 3,000 lb GVW.

Dimensions

• Max trailer length: 40 ft.
• Max combination length (tow vehicle plus trailer): 70 ft.
• Width: 96 in (8 ft). Loads wider need an oversize permit.
• Height: 13 ft 6 in.

The 96 in width is tighter than the 102 in standard most western and northern states use. Standard 102 in travel trailers may technically need a permit in Louisiana.

Hitch and safety chains

All hitch types are accepted in Louisiana as long as they’re rated for the load. Trailers weighing less than 6,000 lb must have safety chains. Trailers over 6,000 lb are typically equipped with safety cables or chains by federal standard but the state statute focuses on lighter trailers.

Tow bars are neither required nor prohibited; the choice depends on the trailer setup.

Trailer lighting

Trailers over 80 in wide need:

• Two front clearance lamps.
• Two rear clearance lamps.
• One side marker lamp on each side.
• One reflector on the front and one on the back.

Trailers over 30 ft long need an amber side marker lamp and reflector at the center of each side.

All trailers need a red rear light visible from 1,000 ft.

Speed limits

Louisiana is one of the few states with explicit trailer speed caps tied to length and brake configuration:

• Trailer under 15 ft, no brakes: 45 mph maximum.
• Trailer 15 to 32 ft, with brakes: 50 mph day, 55 mph night.
• Trailer over 32 ft: subject to posted limits and oversize permit conditions.

These caps apply regardless of posted speed. Most rural Louisiana interstates are 70 mph for passenger vehicles, but a towed trailer is held to the lower limits above.

The day/night split is unusual. Most states do not differentiate by time of day. Drive accordingly.

Mirror rules

All trailers and semi-trailers built after December 31, 1972, must be equipped with a left-side mirror that gives a view of at least 200 ft behind. Tow mirrors are needed when the trailer width exceeds the tow vehicle’s standard mirror range.

Penalties

Most trailer violations in Louisiana are misdemeanors or infractions. Operating without required brakes or lighting can be cited with fines from $50 to $500. Over-dimension violations at weigh stations include fines plus pull-off until corrected.

Practical notes

Louisiana’s 15 ft connection length is tighter than most states. Long-tongue trailers, dolly setups, and unusual cargo configurations can run afoul.

The day/night speed cap split is easy to miss. A 24 ft travel trailer with brakes is legally 50 mph during daylight, 55 mph after dark. Most interstate signs are higher than that, and the tow operator is responsible for knowing the trailer-specific limit.

The 3,000 lb brake threshold matches most southern states (Texas is 4,500 lb, Mississippi is 3,000 lb, Arkansas 3,000 lb). A trailer built for Louisiana towing is legal across most of the South.

The 96 in width is the older standard that many southern and eastern states retain. Modern travel trailers are typically 102 in (legal in the 102 in states by default, technically over-width in Louisiana). Enforcement varies.