A vehicle brochure may say “3,500 kg braked towing capacity”, yet that number alone cannot tell you whether a particular vehicle and caravan will work together when loaded for a real trip. Passengers, accessories, luggage, tow-ball load and the vehicle’s gross combination limit all affect the answer.
The short answer: a sound match must stay within every applicable vehicle, caravan, towbar, coupling, axle and tyre limit at the same time. Start by collecting the manufacturer’s figures, then use the free Can My Vehicle Tow This Caravan? calculator to organise them. Confirm the proposed combination with real loaded measurements before travelling.
Why towing capacity is only the first check
Maximum braked towing capacity is usually the heaviest braked trailer the vehicle manufacturer permits under stated conditions. It is a ceiling, not a promise that the vehicle can tow that mass while also carrying a family, a bullbar, drawers, a fridge and holiday luggage.
Transport WA notes that gross combination mass may be lower than the vehicle’s gross vehicle mass plus its advertised towing capacity. That is why two individually impressive numbers can still produce a combination with very little practical payload.
The weight terms you need in plain English
Vehicle figures
- GVM — gross vehicle mass: the maximum permitted laden mass of the tow vehicle, as specified by its manufacturer.
- GCM — gross combination mass: the manufacturer-specified maximum for the loaded tow vehicle and loaded trailer together. Check the exact definition and conditions for your model.
- Kerb or tare mass: an unladen vehicle figure. Fuel, driver and equipment assumptions vary, so use the definition in the vehicle documentation rather than treating the terms as interchangeable.
- Axle limits: maximum permitted loads for the front and rear axles. A vehicle can be below GVM but still overload an axle.
- Maximum tow-ball load: the maximum vertical load permitted by the vehicle or towbar. Use the lowest applicable component limit.
Caravan figures
- Tare mass: the caravan’s unladen mass as defined and stated by its manufacturer. Verify what was fitted when it was established.
- ATM — aggregate trailer mass: the maximum permitted mass of the loaded caravan, including the load imposed through the coupling when it is supported on a horizontal surface.
- GTM — gross trailer mass: the maximum permitted mass carried through the caravan tyres when coupled.
- Actual tow-ball mass: the vertical load the caravan imposes on the tow vehicle in its current loaded condition.
For a deeper foundation, read ATM, GTM, GVM and GCM explained.
What to collect before you calculate
- The exact vehicle variant, build year and manufacturer handbook.
- Vehicle GVM, GCM, braked towing capacity and front and rear axle limits.
- Towbar and tow-ball maximum ratings.
- Vehicle kerb or tare mass and the definition used.
- Masses of occupants, accessories, luggage, tools, fuel beyond the stated assumption and recovery equipment.
- Caravan plate figures: tare, ATM and GTM.
- Expected loaded caravan mass and actual tow-ball mass.
- Caravan axle, wheel and tyre ratings.
Do not borrow specifications from a similar-looking model. Engine, transmission, body, seating, options and model year can change the ratings.
Where to find reliable figures
Start with the vehicle handbook, manufacturer build or compliance information and the permanently marked towbar rating. For the caravan, photograph the vehicle plate and record the VIN so information can be matched to that unit. Ask the seller for invoices and specifications for fitted batteries, solar, air conditioning, toolboxes and racks.
If you are buying used, a plate and an old weighbridge ticket answer different questions. The plate gives manufacturer ratings; a ticket records one measured configuration on one day. Ask what fuel, water, gas, accessories and personal gear were present. A ticket without this context cannot be safely treated as your future touring mass.
Write down the source beside every number. Label it “manufacturer rating”, “measured”, “product specification” or “estimate”. This small discipline prevents a guessed mass from quietly becoming an apparent fact as the comparison is shared with a partner, dealer or specialist.
Check the match before paying a deposit
A useful pre-purchase process has three layers. First, reject combinations that clearly fail on published ratings. Second, build conservative touring estimates that include the equipment and people you actually expect. Third, make the purchase subject to satisfactory verification where practical.
Ask for the exact caravan tare state and whether options are included. Confirm the tow vehicle variant by VIN rather than relying on a sales description. If a seller says a combination is suitable, request the supporting manufacturer figures in writing. Do not let a promised future GVM upgrade or “easy weight fix” substitute for an acceptable base combination.
Leave a working margin for ordinary variation: an extra passenger, different tank fill, recovery equipment or trip supplies. A combination sitting exactly on several theoretical limits is difficult to manage in real life even before measurement uncertainty is considered.
A worked educational example
Consider a fictional vehicle with a 3,100 kg GVM, 6,000 kg GCM and 3,500 kg braked towing capacity. Its measured touring mass before coupling is 2,850 kg. The proposed caravan is expected to weigh 2,900 kg loaded and impose 260 kg at the tow ball.
- Estimated vehicle mass after coupling: 2,850 + 260 = 3,110 kg.
- That is 10 kg above GVM, even though the caravan is 600 kg below the headline towing capacity.
- Estimated combination mass for this simplified check: 2,850 + 2,900 = 5,750 kg, leaving 250 kg below the stated GCM.
The combination check does not rescue the GVM failure. Every limit must pass. The rear axle and towbar limits must also be checked using real measurements. Moving items from the vehicle to the caravan is not automatically a solution because it may alter caravan ATM, axle load and tow-ball mass.
One change can affect several limits
Adding a 40 kg toolbox to the caravan’s A-frame does more than increase caravan mass. It may increase tow-ball mass, which increases the tow vehicle’s loaded mass and can increase rear-axle load. The caravan axle group may carry less than the full 40 kg change because part is transferred through the coupling.
Likewise, moving equipment from the vehicle cargo area to the rear of the caravan may reduce vehicle mass but reduce ball load and increase caravan axle load. This interconnected behaviour is why “move 50 kg somewhere else” is not a complete answer. Recalculate and remeasure the affected limits after a significant change.
Common matching mistakes
- Comparing caravan tare with the vehicle’s towing capacity instead of using a realistic loaded mass.
- Assuming the vehicle can be at GVM and still tow its maximum advertised mass.
- Forgetting that tow-ball mass loads the tow vehicle.
- Ignoring bullbars, canopies, drawers, roof racks, long-range tanks and auxiliary batteries.
- Checking total masses but not individual axle and tyre loads.
- Using a guessed ball percentage as if it were a measured ball mass.
- Relying on one empty weighbridge ticket after the touring setup changes.
Turn the paper check into a real-world check
A calculator is most useful early: it can expose missing figures before money changes hands. Once the vehicle and caravan are loaded as they will travel, obtain suitable measurements of the combination, tow vehicle, caravan, axles and ball mass. Our Australian weighbridge process explains a repeatable sequence.
Seek help from the vehicle and caravan manufacturers, the relevant state or territory road authority, a reputable weighbridge operator or an appropriately qualified towing or automotive specialist if ratings conflict, an axle is close to its limit, a modification is involved or the combination behaves poorly.
Ready to check your own figures?
Gather the ratings and expected loaded figures above, then use the free Australian caravan towing calculator. It will organise the numbers into a planning estimate and identify which limits deserve closer attention.
The result is not a legal, engineering or safety certification. Verify the exact manufacturer limits and obtain real loaded measurements. You can also explore all free Australian caravan calculators and tools.
From a promising estimate to a verified match
Use the calculator to identify missing figures before purchase, then take its inputs and the manufacturer ratings to a suitable weighing service. The current calculator does not collect every axle, GTM or tyre rating; passing its displayed checks cannot resolve those limits. Follow the weighbridge guide and keep coupled front and rear axle readings with the result.
Frequently asked questions
Can a 3,500 kg-rated vehicle tow every 3,500 kg caravan?
No. Vehicle payload, GVM, GCM, axle loads, tow-ball limit, towbar rating and the caravan’s own limits still apply. The exact vehicle variant and loaded condition matter.
Does caravan ATM include tow-ball mass?
ATM is the manufacturer’s maximum permitted total trailer mass and includes the mass imposed through the coupling when the loaded trailer is supported on a horizontal surface.
Is tow-ball mass part of vehicle payload?
The downward load imposed at the hitch contributes to the loaded tow vehicle and must be considered against GVM and axle limits. Its effect at the rear axle can differ from the simple ball figure because the hitch sits behind the axle.
Should I use tare mass or loaded mass?
Use a realistic loaded mass for matching. Tare is useful for understanding starting capacity, but it does not represent water, gas, options, food and touring equipment.
When should I use a weighbridge?
Before relying on a final match and whenever the touring setup changes materially. Ideally weigh the combination in its normal travel condition with occupants, fuel, water and equipment represented.
Sources and safety note
Last checked: 5 September 2026.
- Australian Government — Vehicle Standards Bulletin 1 Revision 6
- Transport WA — GVM and GCM FAQs
- WA Road Safety Commission — Towing
- NSW Government — Towing a trailer or caravan
This article provides general educational information for light-vehicle caravan planning. Requirements and modification rules can differ by jurisdiction and vehicle. Follow the current manufacturer documentation and the road authority for every place you travel.
Check the complete towing combination
Follow the full sequence in the Caravan Weights & Towing hub: understand the ratings, estimate the load, then verify actual measurements.