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2. Axle - Wikipedia

   en.wikipedia.org/wiki/Axle

   A tandem axle is a group of two or more axles situated close together. Truck designs use such a configuration to provide a greater weight capacity than a single axle. Semi-trailers usually have a tandem axle at the rear. Axles are typically made from SAE grade 41xx steel or SAE grade 10xx steel.

3. Tandem - Wikipedia

   en.wikipedia.org/wiki/Tandem

   Tandem parking means parking one car in front of the other. The word tandem is also used to indicate a semi-trailer truck pulling more than one trailer. Tandem axles means one axle mounted closely in front of another. For trailers, the purpose is to bear heavier loads than a single axle provides. In heavy trucks, tandem refers to two closely ...

4. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   Tractors can pull two or three trailers if the combination is legal in that state. Weight maximums are 20,000 lb (9,100 kg) on a single axle, 34,000 lb (15,000 kg) on a tandem, and 80,000 lb (36,000 kg) total for any vehicle or combination. There is a maximum width of 8.5 ft (2.6 m) and no maximum height. [33] [34]

5. Trailer (vehicle) - Wikipedia

   en.wikipedia.org/wiki/Trailer_(vehicle)

   Full trailer with steered axle. A full trailer is a term used in the United States and New Zealand [4] for a freight trailer supported by front and rear axles and pulled by a drawbar. In Europe this is known as an A-frame drawbar trailer, and in Australia it is known as a dog trailer. Commercial freight trailers are produced to length and width ...

6. Glossary of the American trucking industry - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_the_American...

   In some applications a semi can pull additional full trailers (doubles and triples) with the use of a single axle or tandem axle converter dolly. [10] The use of the term "semi" in the name comes from the semi-trailer, a vehicle whose load is carried partly by its own axles and partly by the pulling vehicle, which is commonly included in ...

7. Road train - Wikipedia

   en.wikipedia.org/wiki/Road_train

   A B-double (single axle steering, tandem drive, and two tri-axle groups) would have an operational weight of 62.5 t (61.5 long tons; 68.9 short tons). A double road train (single axle steering, tandem drive, tri-axle, tandem, tri-axle) would have an operational weight of 79 t (78 long tons; 87 short tons).