When choosing a suspension kit for your 4x4 in Australia, consider the primary use of your vehicle. Here are some common scenarios to help guide your decision:

• General Driving and Off-Road Adventures: For regular driving combined with occasional off-road trips, opt for a balanced suspension kit that offers comfort and decent off-road performance. Heavy-duty kits might lead to an unnecessarily stiff ride.
• Towing: If you occasionally tow a caravan or boat, consider an airbag setup. This provides a better balance than extra heavy-duty coils, which can result in a harsh ride and elevated rear suspension height when not towing.
• Tradesman or Mining Vehicle: For vehicles regularly carrying heavy loads, such as tradesman or mining vehicles, a heavy-duty suspension setup is more appropriate. This ensures your 4x4 can handle the constant load efficiently.

Choosing the wrong suspension setup can lead to several issues:

• Uncomfortable Ride: A heavy-duty suspension kit for occasional heavy loads can make the ride uncomfortably stiff when the vehicle is not carrying a significant load.
• Component Strain: Inappropriately heavy suspension setups can put excessive strain on other suspension components, causing premature wear and damage.
• Rear Suspension Height: Incorrect setups can cause the rear of the vehicle to sit too high or too low, affecting stability and handling.

If you've replaced the factory tub with a steel or alloy tray, consider the additional weight when calculating the total load. Factor in the weight of toolboxes, tools, and equipment that will be carried regularly.

Yes, it is essential to ensure that your suspension setup complies with the legal requirements in your state or territory in Australia. Regulations can vary, so it’s crucial to check the specific guidelines for your location to avoid fines or other penalties.