Light Vehicle Towing vs. Heavy Vehicle Towing

Towing regulations in New Zealand vary significantly between light and heavy vehicles due to differences in size, weight, and operational requirements. Understanding these differences is critical for ensuring safe and legal compliance when towing. A core principle of the New Zealand Road Code is the requirement for drivers to do everything they can to prevent injury to people and damage to property.

Light Vehicle Towing

Light vehicles include cars, SUV’s, utes, vans, and light trailers with a maximum laden weight of less than 3.5 tonnes.

Towing Vehicle Rating

For the safety of yourself and all other road users, it’s strongly recommended to adhere to the manufacturer's specified towing rating for both braked and unbraked trailers. Refer to your vehicle’s handbook and door pillar label for the manufacturer’s tow ratings for your vehicle.

Trailer Requirements

Light trailers must be licensed and have a valid Warrant of Fitness (WoF). They should be in good condition and equipped with a safe and strong coupling, safety chains or cables, a drawbar without damage or corrosion, and safe tyres with a tread depth of at least 1.5 millimetres.

Dimensions and Mass

• Maximum length (including drawbar and load): 12.5 metres.
• Maximum height (including load): 4.3 metres.
• Maximum rear overhang: 4.0 metres.

Loading and Towing Practices

• Ensure the load is evenly distributed.
• Do not overload the roof rack.
• Maintain a maximum distance of 4 metres between the towing vehicle and the trailer.
• At night, ensure the back of the trailer shows a red light, and if towing a disabled vehicle, its headlights must illuminate the towing connection.

Heavy Vehicle Towing

Heavy vehicles encompass trucks, buses, vans, motorhomes, and trailers with a gross laden weight exceeding 3.5 tonnes.

Towing Vehicle Rating

Heavy vehicles must comply with the Vehicle Dimensions and Mass (VDAM) Rule, which sets limits on the maximum allowable weight and dimensions for vehicles and combinations. All Heavy Vehicles must be registered and have a Certificate of Fitness (CoF).

Trailer Requirements

Heavy trailers must be registered and have a Certificate of Fitness (CoF). They should be equipped with appropriate coupling devices, safety chains, and must meet specific axle and braking requirements.

Modifications & Certification

When installing a towbar or drawbeam on a heavy vehicle, the modification must be designed, installed, and certified by an approved engineer to ensure it meets all safety and legal requirements. This is a regulatory requirement under NZTA rules for heavy vehicles.

Coupling Requirements

Selecting the correct coupling is a crucial part of designing and certifying a heavy vehicle towing combination. Unlike light vehicles, which uses a standard towball, heavy vehicles utilise couplings that vary depending on the vehicle ratings and intended use. These options may include 5th wheel assemblies, pintle hooks, heavy-duty towballs, or pin-type couplings. Each must be carefully matched to the vehicle’s certified towing capacity and comply with the applicable New Zealand heavy vehicle towing standards.

LT400

The LT400 is a load rating plate fitted to a certified heavy vehicles. It specifies the maximum towing capacity, coupling ratings, and safe operational limits, providing a clear, on-vehicle reference for drivers and inspectors.

Dimensions and Mass

• Maximum overall length for a heavy rigid vehicle towing two trailers: 20 metres.
• Maximum rear overhang: 4.0 metres or 50% of the forward distance, whichever is less.
• Minimum ground clearance: 100 millimetres, except when loading or unloading.

Loading and Towing Practices

• Ensure the load is evenly distributed to maintain stability.
• Adhere to axle load limits to prevent overloading.
• Use appropriate coupling devices, such as fifth wheels or ball-type couplings, certified for heavy vehicle use.

Summary

Understanding these differences ensures that both light and heavy vehicle operators can tow safely and in compliance with New Zealand's road regulations. Always consult the NZTA guidelines and consider seeking professional advice when in doubt.