Question 1

What are the safety risks of driving over GVM?

Accepted Answer

Driving over your vehicle’s GVM increases stress on suspension, tyres, brakes and axles, which can lead to reduced stability, longer stopping distances, overheating components, premature wear and a higher likelihood of mechanical failure or loss of control, especially in hot or high-speed conditions.

Question 2

Does being close to GVM make my 4WD less stable when towing a caravan or trailer?

Accepted Answer

Yes, being close to your GVM reduces your vehicle’s ability to manage towball download, shifting more weight onto the rear axle and making the 4WD less stable, more prone to sway and more sensitive to crosswinds, uneven roads and passing road trains.

Question 3

How does GVM affect braking distance and emergency stopping in a loaded vehicle?

Accepted Answer

The heavier your vehicle is, the more force the brakes must overcome, so being near or over GVM significantly increases braking distance and reduces emergency stopping performance, especially on hot days when brake fade occurs faster.

Question 4

What are the signs that my suspension is struggling with the weight I’m carrying?

Accepted Answer

Common signs include rear suspension sag, excessive bouncing after bumps, vague or drifting steering, a harsher ride, slower response in corners and a general feeling of instability or “floatiness,” all of which indicate that your suspension is overloaded or under strain.

Question 5

What checks should I do before a big trip to make sure my setup is safe, stable and within GVM limits?

Accepted Answer

Before any long journey, check your vehicle’s actual weight on a weighbridge, confirm that your tyre pressures and load ratings are appropriate, ensure your suspension and brakes are in good condition, review your towball mass if towing and make sure your weight is distributed evenly so the 4WD remains stable and compliant with its GVM.

This rapidly increases heat and leads to fade. Using lower, terrain-appropriate pressures on gravel, sand or corrugated roads allows the tyres to flex and absorb much of the vibration, reducing shock workload and heat buildup. Correct tyre pressures are one of the simplest and most effective ways to prevent shock fade during off-road travel in Western Australia.

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