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📋 Essential Knowledge • Updated Jan 2026

How to Find & Read Your
Vehicle Compliance Plate

Your compliance plate is the single source of truth for what your vehicle can legally tow. Here's how to find it and understand the numbers.

⚡ Quick Reference

GVM
Gross Vehicle Mass - Max loaded weight of your vehicle
GCM
Gross Combined Mass - Vehicle + trailer total
Tow Rating
Max braked trailer weight (ATM)
TBM / Ball Weight
Max weight on the towball

1Where to Find the Compliance Plate

Every Australian vehicle has a metal compliance plate permanently attached. It's usually made of aluminium and riveted to the vehicle.

Common Locations:

🚗 Cars, SUVs, Wagons
  • • Driver's door jamb (most common)
  • • Under the bonnet on firewall
  • • B-pillar (between front and rear doors)
🛻 Utes & Dual Cabs
  • • Driver's door jamb
  • • Engine bay (usually passenger side)
  • • Some have a second plate on tailgate

🔍 Can't Find It?

If your compliance plate is missing, damaged, or illegible, contact your state transport authority. You may need a weight certificate or manufacturer's documentation. Driving without a valid compliance plate can result in defect notices.

2Understanding the Numbers

The compliance plate contains several weight ratings. Here's what each one means and why it matters for towing.

GVM - Gross Vehicle Mass

Critical

The maximum your vehicle can weigh when fully loaded with passengers, fuel, accessories, and cargo.

Example: GVM 3,200kg means total vehicle weight cannot exceed 3,200kg. If your empty (Tare) weight is 2,400kg, you have 800kg for people and cargo.

GCM - Gross Combined Mass

Often Overlooked

The maximum weight of your vehicle plus your trailer combined. This is often the actual limiting factor.

⚠️ The GCM Trap: You might have 3,500kg towing capacity but only 6,000kg GCM. If your loaded vehicle weighs 3,000kg, you can only legally tow 3,000kg - not your full tow rating!

Towing Capacity (Braked)

What Most People Look For

The maximum weight of a trailer with its own braking system. This is matched against the caravan's ATM (Aggregate Trailer Mass).

Matching Rule: Caravan ATM must be ≤ Vehicle Towing Capacity.
A 3,500kg rated vehicle can tow a caravan with up to 3,500kg ATM.

TBM / Ball Weight

Safety Critical

The maximum downward force allowed on your towball. Typically 10% of towing capacity, but check your plate.

Why It Matters: Too little ball weight = trailer sway. Too much = rear axle overload. Most caravans have 10-15% of ATM on the ball when loaded.

3Reading a Real Compliance Plate

Here's how to interpret a typical compliance plate layout. Manufacturers vary slightly, but these codes are standardised.

// Example: 2023 Toyota LandCruiser 300
GVM:
3,350 kg
GCM:
7,000 kg
Towing (Braked):
3,500 kg
TBM (Ball):
350 kg
Calculation Check:
Max tow = min(TowRating, GCM - LoadedVehicle)
If loaded at 3,200kg → max legal tow = 7,000 - 3,200 = 3,800kg ✅

🚨 Common Mistakes

  • ❌ Only checking tow rating and ignoring GCM
  • ❌ Assuming ball weight is always 10% (some are 250kg, 300kg, or 350kg fixed)
  • ❌ Forgetting that aftermarket accessories (bullbar, roof rack) reduce payload
  • ❌ Using brochure specs instead of the actual plate on YOUR vehicle

4What If It's Not on the Plate?

Some older vehicles or imported vehicles may not show all ratings on the plate. Here's what to do:

  • Check Owner's Manual: The full specifications are usually in Section 8 or the "Towing" appendix.
  • Manufacturer Website: Most brands publish spec sheets for all models.
  • Dealer Service: Your dealer can look up your VIN for exact factory specs.
  • Get a Weighbridge Certificate: For actual tare weight, visit a public weighbridge (~$20-40).

🔧 GVM Upgrades

If your vehicle is close to its limits, you may be able to get an engineering GVM upgrade. This involves suspension upgrades and re-certification, typically costing $2,000 - $5,000.

Popular providers: Lovells, Pedders, ARB, and certified automotive engineers.

Ready to Check Compatibility?

Now that you know your numbers, use our free calculator to see which caravans match your vehicle perfectly.