If you’re towing a caravan, camper, or horse float, a weight distribution system (WDS) can make towing safer and more stable—but only if you choose the right one.
For the purpose of this article, “Trailer” refers to a caravan, horse float, or any other trailer.
What is a Weight Distribution System
A weight distribution system (WDS) redistributes the heavy tow ball load across your tow vehicle and trailer axles. Instead of having too much weight pressing down on the rear of your vehicle, a WDS balances it out—improving steering, braking, and overall control.
If done properly, a WDS can help:
- Reduce trailer sway
- Improve braking response
- Minimise tyre wear
- Prevent “porpoising” (that bouncing effect on uneven roads)
But here’s the catch: not all systems are the same, and choosing the wrong one can create new problems.
The “One Size Fits All” Myth
Many towing on our roads assume any WDS will do. In reality, factors like tow ball mass and axle load, A-frame depth, coupling height, and your tow vehicle’s specifications all matter.
For example:
- A lightweight camper trailer might only need a basic setup.
- A large family caravan heading up the Calder with bikes and gear on board may need a heavy-duty system with anti-sway bars.
Some trusted brands, like Hayman Reese, offer systems with customisable spring bars and add-ons. But even then, professional installation and adjustment are key. What works for your neighbour’s dual-cab ute and van may not suit your SUV and pop-top.
Compatibility With Your Vehicle and Trailer
Before even considering a WDS, you need to know your actual weights—not just the manufacturer’s specs. That means weighing your vehicle and trailer in their trip-ready state (fuel, water tanks, gear, passengers, everything).
Why?
- Your axle load limits may not allow extra stress from a WDS.
- WDS are generally not suitable for serious off-road towing (think corrugated Outback tracks).
- In some cases, a suspension upgrade may be more appropriate.
Understanding terms like Aggregate Trailer Mass (ATM), Gross Trailer Mass (GTM), Gross Vehicle Mass (GVM), and Gross Combined Mass (GCM) is essential for staying compliant on the road. Even your trailercaravan’s tare weight impacts your WDS choice.
Adjusting for Load Changes
A properly fitted WDS should last you for years, but it’s not a “set and forget” system. If you add significant weight—like installing a new fridge, carrying more water, or upgrading to e-bikes—you’ll need to adjust your setup.
Best practice:
- Follow the manufacturer’s adjustment guidelines.
- Re-weigh your setup after major changes.
- Stay within your vehicle’s axle load limits.
This keeps your towing legal and safe, and it also extends the life of your tow vehicle.
Professional Assessments in Melbourne & Victoria
Here’s the good news for locals: you don’t need to figure this out alone.
Weigh My Ride is a mobile weigh station service covering metro Melbourne and regional Victoria. Run by a qualified mechanic and licensed vehicle tester with 25+ years of industry experience, they:
- Weigh caravans onsite
- Weigh horse floats
- Weigh commercial vehicles and trailers
- Support race car transporters and trailers
- Assess whether your setup needs a WDS or other upgrades
- Install WDS and tow hitches professionally
- Provide tailored recommendations to keep you safe and legal
They’ll even let you know when they’re in your area if you’re outside Melbourne.
Final Thoughts
Towing safely isn’t just about having the right vehicle and trailer—it’s about making sure the connection between the two is balanced, legal, and road-ready. A properly chosen and fitted weight distribution system can transform your towing experience, giving you stability, confidence, and peace of mind.
But remember: there’s no universal solution. Every setup is unique, and the safest option is to get your setup weighed and assessed by a professional.
Stay safe, stay legal, and enjoy the freedom of the open road. Contact Weigh My Ride today!
