Car Licence or Light Rigid? How to Size a Cab Chassis Truck by GVM and Payload

Key Takeaways

• The licence follows the truck's rated GVM, not its weight on the day. A standard car licence covers up to 4.5 tonnes GVM. Above that you need Light Rigid (to 8 tonnes), then Medium Rigid (two axles, over 8 tonnes). An empty 6.5-tonne truck still needs an LR licence.

• A 4.5-tonne truck carries about 2 tonnes, not 4.5. Ready-built car-licence trays are advertised with payloads of around 1.9-2 tonnes once the body is fitted, because the cab, chassis and body use more than half the GVM.

• Dual-rated trucks buy you flexibility. Models such as the Isuzu NPR 45/65 can be plated at 4.5 tonnes for car-licence drivers or 6.5 tonnes for more payload. Hino's 616 alloy tray goes from about 1.9 to 2.9 tonnes of payload at a 5,500 kg rating.

• Size the truck from your heaviest regular load. Add the body, accessories, driver, passengers, fuel and tools, then keep a margin. Every bullbar and toolbox comes out of payload.

• Above 4.5 tonnes, the Heavy Vehicle National Law applies. Expect heavy vehicle registration charges, and above 12 tonnes GVM, fatigue and work diary rules.

Which licence do I need to drive a cab chassis truck?

Licence classes are the same in every state and territory, and they are based on the truck's gross vehicle mass (GVM): the maximum loaded weight the manufacturer rates it to carry, shown on its compliance plate.

The same GVM rule applies whatever the fuel type. Battery-electric light trucks such as the Fuso eCanter and Foton T5 are offered in 4.5-tonne versions for car-licence drivers, but their battery weight is part of the tare, so check payload carefully.

What is the difference between GVM, tare, payload and GCM?

These four numbers decide whether a truck can legally do your job.

• GVM (gross vehicle mass): the most the truck may weigh fully loaded. This sets the licence class.

• Tare: what the truck weighs empty. For a cab chassis, the body, accessories and fuel add to the tare you will actually run.

• Payload: GVM minus the truck's real weight as built, including the body, driver, passengers and fuel. This is what you can carry.

• GCM (gross combination mass): the most the truck and a loaded trailer may weigh together. A 4.5-tonne Isuzu NLR has a GCM of 8,000 kg, and the car-licence Hino 616 is rated at 7,995 kg GCM with a tow rating of up to 3,500 kg.

Brochure payload figures are often quoted before the body is fitted. Ask for the payload of the truck as it will be delivered, with your body and accessories on it.

How much can a 4.5-tonne truck actually carry?

About 2 tonnes, for a typical tray truck. Dealers advertised the 2026 Isuzu NLR 45-150 Traypack at about 2 tonnes of payload on a 4,500 kg GVM, and a Hino 616 alloy tray pack at about 1.9 tonnes at 4,495 kg GVM. That implies each truck weighs roughly 2.5-2.6 tonnes ready to work.

The working sum looks like this:

1. Start with the GVM on the compliance plate: 4,495 kg.

2. Subtract the truck as built, with body and fuel: about 2,600 kg.

3. Subtract the driver, passengers and tools you always carry: say 150 kg.

4. What is left is your real payload: about 1,745 kg.

Heavier bodies cut that number quickly. Steel trays, tippers, pantechs, refrigerated bodies and service bodies all weigh more than a plain alloy tray, and Euro 6 trucks are heavier than the models they replaced because of their emissions equipment.

When does a dual-rated GVM make sense?

When you hire drivers on car licences now but expect heavier loads later. Several light trucks are sold with two GVM ratings: Isuzu's 45/65 models, Fuso's Canter 615 with a car or light truck rating, and the Iveco Daily 70C, which can be de-rated to 4,495 kg.

A higher rating can add a large share of payload. Hino's 616 alloy tray pack, for example, is advertised at about 1.9 tonnes of payload at 4,495 kg and about 2.9 tonnes at 5,500 kg. Before you choose, ask the dealer what re-rating involves later, and price stamp duty and registration at both ratings.

Should I step up to a Light Rigid truck?

Step up if your regular loads leave less than a few hundred kilograms of margin on a 4.5-tonne truck. Running at the limit every day risks overloading fines, faster wear on brakes and suspension, and insurance problems after an incident.

The trade-offs are real. An LR or MR truck needs drivers with the right licence, which narrows the people you can roster. It also brings the truck under the Heavy Vehicle National Law, with heavy vehicle registration charges, and in many states a different stamp duty rate. If your work regularly needs a 3.5-4.5 tonne payload or an 8-pallet body, a light rigid truck in the 6.5-8.8 tonne range is usually the honest answer.

How do I choose the right GVM before I ask for quotes?

Work backwards from the job:

1. Write down your heaviest regular load, not the average one.

2. Add the body type you need and its approximate weight (ask the body builder).

3. Add accessories: bullbar, towbar, toolboxes, racks, crane or tailgate loader.

4. Add driver, crew and fuel.

5. Keep a margin of at least 10% for variation in loads.

6. Match the total to a GVM rating, then to the licence your drivers hold.

If the answer lands just above 4.5 tonnes, compare a dual-rated truck against a lighter body before you commit to licence upgrades.

Compare cab chassis trucks from Australian suppliers and include your payload target and licence class in your quote request, so suppliers can recommend the right GVM.

Frequently asked questions

Can I drive a 6.5-tonne truck on a car licence if it is empty?

No. The licence class is based on the GVM shown on the truck's compliance plate, not how much it weighs at the time.

What is the biggest truck I can drive on a car licence in Australia?

Any vehicle with a GVM up to 4.5 tonnes that seats no more than 12 adults. Most light-truck brands offer 4,495-4,500 kg models for this reason.

Can I tow a trailer with a 4.5-tonne truck on a car licence?

Yes, one trailer up to 9 tonnes GVM, but you must also stay within the truck's own tow rating and GCM, which are usually much lower.

How long does it take to get a Light Rigid licence?

You need to have held a car licence for at least 12 months, then complete training and a test. Timing and cost vary by state and training provider.

Does a heavier body reduce my payload?

Yes, kilogram for kilogram. Ask every supplier for the delivered weight of the truck with body and accessories fitted.