Ask Our Experts

By Grant Wakerley, Technical Project Manager, RV Supplies

When it comes to towing a caravan or trailer, most of us focus on the big things: making sure the tyres are good, the brakes are working, and the mirrors give us clear visibility. However, there is one element that often gets overlooked yet plays a significant role in safety: tow ball weight and how your load is distributed.

Why tow ball weight matters

Tow ball weight, sometimes called tow ball download or nose weight, is the downward force the trailer applies to the tow ball of your vehicle. Get it wrong, and you can quickly run into stability issues. Too much weight and the rear of your vehicle sags, steering becomes lighter, and braking efficiency can be compromised. Too little weight and the trailer may sway or fishtail, especially at speed or in windy conditions.

The general rule of thumb in New Zealand is that the tow ball down weight should be around 7 to 10 percent of the loaded trailer weight. For example, if your caravan weighs 1,600kg fully loaded, the tow ball weight should typically be between 112kg and 160kg.

Understanding tare weight and loaded weight

Tare weight is the weight of your caravan or trailer as it leaves the factory, empty and without water, gas bottles or luggage. Gross Vehicle Mass, or Maximum Laden Weight, is the maximum weight your caravan is legally allowed to weigh when fully loaded. The difference between tare and GVM is your payload: all the gear, water, food and equipment you load in. It is crucial not to exceed the manufacturer's GVM, and to distribute your payload evenly, heavy items low down and close to the axle, lighter items stored higher up.

How to get it right with a tow ball weight gauge

One of the easiest ways to check your setup is by using a Milenco Tow Ball Weight Gauge. Load your caravan or trailer as you would for travel, place the gauge under the coupling and lower it onto the device, and it will give you an accurate reading of the down weight on the tow ball. This simple step gives peace of mind that your towing setup is within safe limits, protecting your vehicle, your caravan and everyone else on the road.

Tips for safer weight distribution

Keep the heaviest gear low and close to the axle, avoid overloading the rear of the caravan since this reduces tow ball weight and can cause sway, double check weights if you change your packing between trips, and always check your licence class and vehicle's rated towing capacity.

Final thoughts

Safe towing isn't just about rules and regulations; it's about making your holiday stress free and enjoyable. By taking a few minutes to measure your tow ball weight with a Milenco Tow Ball Weight Gauge and keeping within your caravan's rated limits, you'll be setting yourself up for a much smoother ride.

Stay safe out there,

Grant Wakerley
Technical Project Manager, RV Supplies