With a factory GVM of 3,280kg and a kerb weight of 2,630kg*, you can only legally carry 730kg before you're over your weight limit. If you consider just passengers, a few accessories - a small fridge, a rear drawer) and a van, you're pretty quickly over your 730kg carrying capacity. If you were to properly equip your 300 series with a bull bar, roof-rack, long-range tank, then you'll certainly need a GVM upgrade. Completing the GVM upgrade ensures you have the necessary suspension setup to carry the added weight, along withthe compliance to do so legally.
* Weights taken directly from Toyota Specs on the GR Sport.
4.2T GVM Upgrade for an ASG 4x4 Dual Cab Conversion
Get the maximum from your 300 series dual cab! With a diff reinforcement your rear axle load gets to 3000kg.
Touring Solutions Australia (TSA) is proud to provide this upgrade, which increases your vehicle’s Braked Towing Capacity (BTC) to 4000 kg. This upgrade allows you to legally tow above the standard 3500 kg, or provides an extra “cushion” when towing near the maximum limit.
These recommended upgrades are designed to protect your transmission and driveline when towing heavy loads and provide extra peace of mind. They are intended to enhance reliability and longevity, not to increase towing performance.

View Ford F-150 Factory Specs Here: https://www.ford.com.au/vehicles/download-brochure/
View Dodge Ram 1500DT Factory Specs Here: https://www.ramtrucks.com.au/download-brochure/
View Ford Next Gen Ranger Factory Specs Here: https://www.ford.com.au/vehicles/download-brochure/
Front Axle Capacity
Rear Axle Capacity
1,850kg
2,570kg
Wheel Load Rating
Tyre Load Rating
1,285kg min.
1,285kg min.
Tyres
285/65R18 PRE-REGO
285/65R18 POST-REGO
3,500kg (pre)
Front Axle Capacity
Rear Axle Capacity
1,850kg
3,000kg
Wheel Load Rating
Tyre Load Rating
1,500kg
Tyres
285/65R18 PRE-REGO
285/65R18 POST-REGO
Front Axle Capacity
Rear Axle Capacity
1,630kg
1,850kg
Wheel Load Rating
Tyre Load Rating
-
-
Tyres
265/65R18 PRE-REGO
Front Axle Capacity
Rear Axle Capacity
1,850kg
2,570kg
Wheel Load Rating
Tyre Load Rating
1,285kg min.
1,285kg min.
Tyres
285/65R18 PRE-REGO
285/65R18 POST-REGO