Do You Need a Towing Upgrade?

You’ve weighed your rig at the weighbridge and the numbers are tight, or worse, over the limits. Now you need to decide: reduce weight or upgrade your vehicle’s capacity. This guide helps you work out which approach makes sense for your situation.

Option 1: Reduce Weight

Before spending money on upgrades, ask whether you actually need everything you’re carrying. Most caravanners overpack, particularly for their first trip. Common weight savings include travelling with half-full water tanks and filling up at camp (saves 50 to 100kg), removing “just in case” items you haven’t used in three months, replacing heavy steel tools with lighter alternatives, and reassessing how much food, clothing, and spare gear you genuinely need.

A brutal gear audit can save 50 to 150kg. That might be all you need to get within limits without any mechanical modifications.

Option 2: GVM Upgrade

A GVM upgrade increases your vehicle’s legal maximum loaded weight. This is an engineering modification that typically involves upgraded springs, shock absorbers, and sometimes brake components. Once certified by an engineer and recorded on a new compliance plate, it becomes the vehicle’s legal GVM.

GVM upgrades typically add 200 to 500kg of legal capacity and cost $2,000 to $5,000 depending on the vehicle and the amount of upgrade. Companies like Lovells, Pedders, and ARB offer certified GVM upgrade kits for popular tow vehicles.

This is the right solution if your vehicle’s GVM is the bottleneck (which it often is) and you can’t practically reduce weight enough to get within limits.

Option 3: Suspension Upgrade (Without GVM Change)

Upgrading your suspension (heavier springs, better shock absorbers, airbags) improves how the vehicle handles the weight but does NOT change the legal GVM. This is a comfort and safety improvement, not a legal capacity increase. The vehicle handles better, the ride is more controlled, and it’s safer to drive, but you’re still bound by the original GVM limit.

Suspension upgrades ($500 to $2,000) are worth doing regardless of whether you also get a GVM upgrade. A vehicle that handles its load well is safer and more pleasant to drive.

Other Towing Improvements

Transmission cooler: Towing puts enormous strain on your vehicle’s transmission. An aftermarket transmission cooler ($200 to $500 installed) keeps transmission fluid temperatures down, extending transmission life significantly. Recommended for any vehicle doing sustained towing, particularly in hot conditions or hilly terrain.

Brake upgrade: Larger brake pads, upgraded rotors, or braided brake lines improve stopping power when loaded. Not a legal requirement but a genuine safety improvement for heavy towing. $500 to $1,500 depending on the extent of the upgrade.

Weight distribution hitch: Doesn’t change any weight limits, but distributes the tow ball weight more evenly across all axles of the vehicle, improving handling and levelling the vehicle’s stance. Particularly beneficial for vehicles that sag at the rear when hitched. $300 to $800.

So What Should You Do?

If you’re 50kg or less over GVM: Start with a weight audit. You can almost certainly shed 50kg by removing unnecessary gear and managing water levels.

If you’re 50 to 200kg over GVM: A GVM upgrade is likely the right call, combined with a weight audit. The cost is significant but it solves the problem properly and legally.

If you’re more than 200kg over GVM: You may need a different vehicle, a smaller caravan, or both. GVM upgrades have limits, and significantly exceeding your vehicle’s design capacity isn’t solved by springs alone.

If your GCM is the bottleneck: GCM cannot typically be upgraded. You need to reduce the combined weight of vehicle plus caravan. This usually means a lighter caravan.

If your towing capacity is the limit: Towing capacity cannot be increased. The caravan must come in under the vehicle’s rated maximum. No modification changes this.