Towed Mass

Depending on how the trailer/implement is braked, the following masses and speeds are permitted:

Trailer/implement brake system	Maximum permissible towed mass	Top speed
- unbraked..............	3000 kg (6615 lb)	25 km/h (15.5 mph)
- independent..............	4000 kg (8820 lb)	25 km/h (15.5 mph)
- overrun brake..............	8000 kg (17635 lb)	25 km/h (15.5 mph)
- hydraulic brake..............	34000 kg (74955 lb)	25 km/h (15.5 mph)
- single-line air brake..............	34000 kg (74955 lb)	25 km/h (15.5 mph)
- dual-line air brake..............	34000 kg (74955 lb)	Maximum design speed

There may be legal limits in force that restrict the maximum towed mass and/or travel speeds to figures lower than those quoted here.