Sway after a crosswind, a passing truck or a change in packing does not automatically mean the hitch is faulty. The disturbance may expose a loading problem, an axle overload or inadequate trailer braking. Work through the combination before ordering an anti-sway accessory.
1. If the caravan starts swaying: stabilise, then stop safely
The Australian 2026 Shark 6 handbook instructs the driver to hold the steering wheel firmly and reduce speed gradually, rather than accelerate to eliminate sway. See its Trailer Towing guidance on page 107.
- Keep both hands on the wheel and avoid abrupt steering or other sudden control inputs.
- If your installed controller provides independent trailer braking, use it only as instructed and practised for that controller; do not look away from the road searching for the control.
- Once stable, stop somewhere safe and investigate before continuing the trip.
RAC WA explains independent trailer-brake operation and why drivers should know the manual control before an emergency. It is different from sharply applying the tow vehicle’s brakes.
2. Identify the Shark 6 variant before using a towing number
The Australian range now includes different engines and towing limits. A headline figure for the Performance model must not be applied to an earlier Premium or another 1.5-litre configuration.
| Configuration or document | Published figure | Application boundary |
|---|---|---|
| Current 1.5L Dynamic / Premium range | 2,500 kg maximum braked towing | Confirm the exact vehicle, fitted towing equipment and applicable handbook |
| Current 2.0L Performance | 3,500 kg maximum braked towing | Do not transfer its rating to a 1.5L vehicle |
| Configuration covered by the 2026 handbook towing table | 2,500 kg braked; 750 kg unbraked; 250 kg maximum vertical ball load | This table does not establish those same limits for the 2.0L Performance |
Sources: BYD Australia’s current model range and the 2026 handbook, page 105. Registration year alone is not enough to select a rating.
The lowest applicable vehicle, towbar, towball, coupling and trailer limit governs the relevant load. Staying below a maximum trailer figure also does not prove compliance with GVM, GCM, axle ratings or the caravan’s own limits.
3. Weigh the combination without counting tow ball mass twice
A useful weighbridge record separates the loaded ute’s front and rear axles from the caravan axles. Arrange a suitable weighing procedure with the operator or a mobile caravan-weighing service, including tow ball measurement at the correct coupling height.
- Load for the actual trip: people, water, fuel, food, tools and fitted accessories.
- Record the loaded ute before coupling and its front and rear axle loads when coupled.
- Record the caravan axle load when coupled and its total loaded mass using a suitable separate weighing procedure.
- Record tow ball mass, coupling height and water-tank state so measurements can be compared.
| Check | Measured quantity | Compare against |
|---|---|---|
| Tow vehicle mass | Coupled front axle + coupled rear axle | The vehicle’s applicable GVM |
| Individual axle loading | Each coupled axle reading separately | The applicable front and rear axle ratings |
| Total loaded caravan mass | Caravan axle load + tow ball load in the measured configuration | Caravan ATM and applicable towing limits |
| Caravan axle loading | Load transmitted through the caravan wheels when coupled | Plated GTM and axle, tyre and suspension ratings |
| Combined actual mass | Coupled ute axle total + coupled caravan axle load | The applicable GCM |
ATM and GTM on a caravan plate are ratings, not a substitute for measuring your packed caravan. Tow ball load is already included in the coupled ute’s axle total. Adding the caravan’s whole loaded mass to that coupled total would count it twice.
RAC WA’s loading guide explains how rear-axle or combination limits can be exceeded even when individual headline limits appear acceptable.
Why 200 kg on the towball can add more than 200 kg to the rear axle
The towball sits behind the rear axle, so its downward force also unloads the front axle. In a simplified stationary model, the rear-axle increase is T × (1 + a/L), where T is ball load, a is rear-axle-to-ball distance and L is wheelbase.
For an illustrative 200 kg ball load, 1.3 m overhang and 3.26 m wheelbase, the rear axle gains about 280 kg while the front loses about 80 kg. This is a static calculation on level ground without a weight-distribution hitch, not a vehicle-specific load allowance.
Road movement adds changing forces. Do not turn the calculation into a universal dynamic multiplier or a higher permitted ball load. Measure the actual axle loads; suspension helpers do not themselves change certified ratings.
4. Match the symptom to the next useful check
The following are diagnostic possibilities, not proof of a single cause. A gust may trigger sway in a combination that already has poor loading or a mechanical fault.
| Symptom | Useful next check | Avoid this shortcut |
|---|---|---|
| Sway started after repacking or changing water levels | Reweigh ball load, caravan axles and the coupled ute; inspect load restraint | Adding weight to the drawbar without checking every affected limit |
| Sway in crosswinds or when trucks pass | Reduce exposure and speed appropriately; examine loading and the combination’s stability | Assuming wind makes repeated sway acceptable |
| The caravan pushes the ute while braking | Check trailer brake operation, controller setup, supply and mechanical condition | Increasing gain to mask a failed circuit or worn brakes |
| The rear drops and steering feels light | Measure both vehicle axle loads and coupling height | Using rear suspension lift as evidence that the weights are legal |
| Uneven tyre wear, pulling or vibration | Workshop inspection of tyres, alignment, bearings, suspension and coupling | Calling every handling fault “sway” and fitting a damper |
| Trailer lights work but electric brakes do not | Verify a functioning controller and the complete brake-output circuit under an appropriate test | Assuming a connected seven-pin plug proves brake operation |
Keep heavy caravan items low and near the axles rather than at the extreme rear. However, do not move everything onto the drawbar: ball load, ute mass and rear-axle load can then become the limiting factors. Secure the revised load and reweigh.
Use the cold tyre pressures specified for your actual vehicle, tyres and loading, together with the caravan’s instructions. The 2024 and 2026 Shark handbooks contain different rear towing-pressure wording, so a copied universal pressure is not appropriate.
5. Separate vehicle sway intervention, trailer brakes and automatic anti-sway equipment
Vehicle ESC sway intervention
The 2026 handbook describes ESC applying braking when trailer sway is detected. That does not establish that an aftermarket controller is installed, calibrated or delivering current to the caravan brakes.
Trailer brake control
A compatible controller operates the trailer’s brakes and may provide a manual trailer-only control. A separate automatic trailer anti-sway system has its own functions and compatibility requirements.
Regenerative slowing does not, by itself, prove that trailer brakes are being activated. A proportional controller can use measured deceleration, but its required trigger, power, earth and output wiring still need verification. Do not assume every deceleration event commands trailer braking.
The 2026 handbook’s socket table marks pin 5 as reserved and not connected in the documented configuration. Therefore, plug shape and working lamps alone are insufficient evidence of an installed electric-brake output.
For controller selection and commissioning, use the separate Shark 6 proportional versus time-delay controller guide. For lamp faults, use the trailer-lights diagnostic guide.
When a controller is a relevant purchase
If your caravan uses compatible electrically controlled brakes and the required controller is missing or unsuitable, investigate that system. If braking is already correct and the problem is loading, buying another controller is not the first step.
6. Check towing mode without assuming all driver aids remain active
For the configuration covered by the 2026 handbook, towing mode changes driver-assistance availability. Pages 111–112 list disabled functions including adaptive cruise, blind-spot detection, rear cross-traffic functions and lane-assistance functions.
The same handbook separately describes cruise control in towing mode on page 113. That is not permission to assume adaptive cruise remains active, or that cruise can correct sway. Match the instructions to your vehicle and software.
Check the towing indicator and any fault message after connecting the trailer as instructed. The documented normal towing mode uses NORMAL drive mode; do not prescribe Sport, Snow or another terrain setting as an unverified cure.
7. Repair the cause and verify the complete combination
- Inspect first. Check the coupling, towbar attachment, chains, tyres, visible wiring and any damage after the event.
- Measure the actual trip load. Record vehicle axles, caravan axles, total caravan mass and ball load using a suitable weighing procedure.
- Compare every applicable rating. Include GVM, GCM, axle and tyre limits, caravan ATM/GTM and towing-component ratings.
- Correct the identified problem. Reload, reduce carried mass or have mechanical and electrical faults repaired as appropriate.
- Commission any changed equipment. Follow the controller and caravan instructions for brake mode, calibration and controlled brake testing.
- Escalate unresolved instability. Use a qualified caravan workshop and BYD service provider before resuming normal towing.
A weight-distribution hitch or other stabilising device must be compatible with the vehicle, towbar, coupling and caravan. Obtain approval for the actual equipment rather than fitting a generic device to mask overweight loading.
Keep weighbridge records, fitted-component ratings and the installer’s brake-test results. These establish what was checked more clearly than saying the suspension looks level or the caravan is below its advertised towing limit.
BYD Shark 6 caravan sway FAQ
Does the Shark 6 have trailer sway control?
The Australian 2026 handbook describes ESC braking intervention when trailer sway is detected. Confirm that handbook and equipment apply to your vehicle. It does not replace correct loading, working trailer brakes or a compatible controller where required.
Is the Australian towing limit 2,500 kg or 3,500 kg?
The current Australian site lists 2,500 kg braked for the 1.5L Dynamic/Premium range and 3,500 kg for the 2.0L Performance. Use the rating and other load limits for your exact vehicle and fitted towing equipment.
Should tow ball mass always be ten per cent?
No percentage overrides the vehicle, hitch or caravan instructions. Measure the packed caravan’s ball load and meet the applicable loading requirements without exceeding any limit. A manufacturer’s minimum is not automatically the ideal stability target.
Does tow ball load reduce the ute’s remaining payload?
Yes. It adds to the coupled vehicle’s mass and also changes front and rear axle loads. Check both GVM and individual axle ratings; a rear axle can gain more load than the ball mass because of the hitch’s position behind it.
Does a seven-pin socket mean the electric brakes work?
No. Lighting circuits and electric-brake output require separate verification. The 2026 handbook’s socket table marks pin 5 as reserved and not connected for its documented configuration.
Will a proportional controller automatically stop all sway?
No. It controls compatible trailer brakes and may provide independent manual braking. It is not automatically a trailer anti-sway system and cannot correct overload, poor load distribution, worn tyres or a damaged coupling.
Does regenerative braking always activate the trailer brakes?
Do not assume so. The controller’s trigger logic and the complete installed circuit must be checked. An inertia sensor does not remove the need for the specified power, trigger, earth and output connections.
Can airbags or a weight-distribution hitch increase my towing rating?
Do not treat a levelling accessory as a rating increase. Confirm equipment approval and the vehicle’s applicable certified limits. Level appearance does not prove compliant axle loads or correct caravan balance.
Can I use adaptive cruise while towing?
The 2026 handbook lists adaptive cruise among functions disabled in towing mode and separately describes towing-mode cruise control. They are not the same function. Follow the instructions for your actual vehicle and software.
Can I continue after moving a few bags?
Only correcting the packing visually is insufficient if the cause remains unknown. Recheck weights, restraint and equipment condition. Persistent or unexplained instability needs professional inspection before further towing.
Sources and related reading
- BYD Australia Shark 6 model range — current variant-specific braked towing figures.
- 2026 Australian Shark 6 handbook — towing pages 105–113; check applicability to your vehicle.
- 2024 Australian Shark 6 handbook — earlier vehicle instructions; do not mix editions indiscriminately.
- RAC WA loading guidance — mass limits, axle loading and restraint.
- RAC WA brake-controller guidance — controller function, setup and independent trailer braking.
- Shark 6 controller comparison and installation checks.
- Shark 6 trailer-light fault diagnosis.
Browse BYD Shark 6 parts and accessories after identifying the required component. A product listing is not evidence that every towing configuration is compatible.
