How much can I tow?

Refer to manufacturer of tow vehicle.

What is the longest/widest/highest I can go?

The total combination is less than 19m and the trailer is less than 12.5m, 2.5m wide, 4.3m high. All these are without permits.

What type of brakes do I need?

Refer ADR38/05,

  • Up to 750kg GTM – exempt.
  • Up to 2000kg GTM – effective override brakes.
  • Up to 4500kg GTM – Breakaway brakes, electric, air, twin line vacuum.
  • Over 4500kg GTM – Federal Office of Road Safety complied, air over mechanical braking system including complete with electronic ABS on the trailer.
  • Over 9000kg GTM – Federal Office of Road Safety complied, air over mechanical braking system with electronic ABS and EBS protection on the trailer.

GVM/GTM?
GROSS TRAILER MASS (GTM) – the mass transmitted to the ground by the ‘Axle’ or ‘Axles’ of the trailer when coupled to a drawing vehicle and carrying its maximum load approximately uniformly distributed over the load bearing area, and at which compliance with the appropriate Australian Design Rules has been or can be established.

This differs distinctly from

AGGREGATE TRAILER MASS (ATM) – the total mass of the laden trailer when carrying the maximum load recommended by the ‘Manufacturer’. This will include any mass imposed onto the drawing vehicle when the ‘Combination Vehicle’ is resting on a horizontal supporting plane.

TARE MASS this is the unladen weight of the trailer