HOLDEN WH II 2002 Series Owner's Handbook Manual page 172

When towing, your tyres should be inflated to the maximum recommended pressure
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(refer Chapter 7 for the tyre placard location).
Ensure that a load distribution hitch is correctly distributing the ball load.
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Tighten the tow ball retaining nut to 175 Nm and check the torque frequently.
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Your car will handle differently when towing. It's a good idea to make a couple of
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short distance trips with the caravan or trailer before you set off on the big one.
Have your car correctly maintained and serviced.
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Have your caravan or trailer maintained and serviced, with particular attention given
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to condition of brakes, tyres, suspension, wheel bearings, towing coupling and
lighting.
You should have an extended-arm mirror on both sides of your car.
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Headlights may need re-aiming after the loaded caravan has been hitched,
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particularly if a load distribution hitch is not used.
Use a lower gear, rather than your brakes, when descending steep hills.
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If your caravan or trailer moves off the road behind you, allow the left wheels of your
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car to move off as well. When it is safe to do so, carefully steer back on to the road.
A sudden attempt to steer back could make you swerve dangerously.
Automatic transmission: To stop the transmission constantly changing between 3rd
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and 4th gear, it is recommended that the "Power" mode be selected when towing.
Refer page 4-4 for selection of "Power" or "Economy" modes.
Do not use axle-mounted hitches. They can cause damage to the axle housing,
wheel bearings, wheels and tyres.
Ensure that the tow bar does not obscure the rear licence plate. If necessary,
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remove the towbar tongue when it is not required for towing.
If a towbar is removed, be certain to have any mounting holes in the underbody
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properly sealed to prevent the possible entry of exhaust fumes, dust and water.
TRAILER BRAKES:
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Trailer brakes are recommended on trailers weighing 500 kg when loaded. Some
States require trailer brakes on loads less than 500 kg and you should check your
State's requirements.
The brakes on the trailer or caravan must be designed to cope with the braking
requirements of that trailer or caravan under all towing conditions, without adversely
affecting the brakes on the car.
Different types of brake signalling devices are available for trailers, such as electric,
overrun or hydraulic signalling. If a hydraulic signalling type is used, it must not
displace more than 0.21 cc of fluid during braking. It must not be fitted to the front
brake system, only to the rear brake system. While no recommendation is made by
Holden with regard to the manufacturer of the brake system, the specifications
issued by PBR indicate that their unit meets Holden requirements.
TOWING PRECAUTIONS
Chapter 10
10-7
TOW & LOAD