Dolly (trailer)
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Image:Dolly trailer.jpg A dolly that can be coupled to a truck or trailer so as to support a semi-trailer. The dolly is equipped with a fifth wheel to which the semi-trailer is coupled. This dolly needs its own rear lights and a registration plate.
There are three types:
- Convertor dolly or A-dolly, equipped with a single drawbar with a centred coupling to connect to the rear of the truck or trailer in front.
- C-dolly, equipped with two couplings side-by-side to connect to the truck or trailer in front.
- Low Loader dolly, equipped with a gooseneck type drawbar that attaches to the fifth-wheel coupling on the rear of a prime mover to distribute the mass on the fifth wheel on the dolly between the prime mover and the wheels of the dolly.
[edit] Australia
Convertor dollys are used in road trains in Australia, most commonly with two or three axles and a hinged drawbar. They are also frequently referred to as road train dollys.
The C-dolly design is not allowed in Australia, as it prevents articulation between the dolly wheels and the axles of the truck or trailer in front of the dolly. Australian rules require articulation between axle groups.
Low Loader dollys are used with many Low loaders to allow large, heavy cargo such as mining machinery to be carried without overloading the wheels of the prime mover or low loader.
[edit] See also
[edit] External References
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