Trailers
Pig trailer
A trailer with one axle group or single axle near the middle of its load-carrying surface and connected to the towing vehicle by a drawbar.
Nominated Configuration Code PTR.
Number of axles | Configuration code |
1 | TP1 |
2 | TP2 |
3 | TP3 |
4 | TP4 |
5 | TP5 |
6 | TP6 |
7 | TP7 |
8 | TP8 |
9+ | TP9 |
Dog trailer
A trailer with one axle group or single axle at the front that is steered by connection to the towing vehicle by a drawbar, and one axle group or single axle at the rear.
Nominated Configuration Code DTR.
Number of axles | Configuration code |
1 at front and 1 at rear | TD11 |
1 at front and 2 at rear | TD12 |
1 at front and 3 at rear | TD13 |
2 at front and 2 at rear | TD22 |
2 at front and 3 at rear | TD23 |
3 at front and 3 at rear | TD33 |
4 at front and 4 at rear | TD44 |
4 at front and 5 at rear | TD45 |
Semi-trailer
A trailer (including a pole type trailer) that has one axle group or single axle towards the rear, and a means of attachment to a prime mover or a converter dolly that results in some of the load being imposed on the prime mover, or the converter dolly, as the case may be.
The National Heavy Vehicle Regulator has amended the definition of tag trailers, as part of the National Heavy Vehicle Law amendments. As of 1 July 2018, all tag trailers will be a sub-category of semi-trailers and must be registered as semi-trailers.
From 1 July 2018, the registered operator of a tag trailer currently registered as a pig trailer will need to complete a Change of Records form and change the nominated configuration from a pig to a semi/tail trailer (STR).
Registration classification will stay the same for tag trailers already registered as a semi-trailer.
Nominated Configuration Code STR.
Number of axles | Configuration code |
1 | TS1 |
2 | TS2 |
3 | TS3 |
4 | TS4 |
5 | TS5 |
6 | TS6 |
7 | TS7 |
8 | TS8 |
9+ | TS9 |
B-double lead trailer and B-triple lead and middle trailer
B-double lead trailer: A semi-trailer that is nominated for use as the lead trailer in a B-double combination.
B-triple lead trailer: A semi-trailer that is nominated for use as the lead trailer in a B-triple combination.
B-triple middle trailer: A semi-trailer that is nominated for use as the second trailer in a B-triple combination.
Nominated Configuration Code LTR.
Number of axles | Configuration code |
1 | TL1 |
2 | TL2 |
3 | TL3 |
4 | TL4 |
5 | TL5 |
6 | TL6 |
7 | TL7 |
8 | TL8 |
9+ | TL9 |
Dollies
Converter dolly: A trailer with a fifth wheel coupling designed to support a semi trailer for hauling purposes.
Low loader dolly: A mass-distributing device that is usually coupled between a prime mover and low loader, and consists of a gooseneck rigid frame, and does not directly carry any load on itself, and is equipped with one or more axles, a kingpin and a fifth wheel coupling.
Nominated Configuration Code YTR.
Number of axles | Configuration code |
1 | TY1 |
2 | TY2 |
3 | TY3 |
4 | TY4 |
5 | TY5 |
6 | TY6 |
7 | TY7 |
8 | TY8 |
9+ | TY9 |