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2. Trailer (vehicle) - Wikipedia

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

   In the United States trailers ranging in size from single-axle dollies to 6-axle, 13-foot-6-inch-high (4.1 m), 53-foot-long (16.2 m) semi-trailers are commonplace. The latter, when towed as part of a tractor-trailer or "18-wheeler", carries a large percentage of the freight that travels over land in North America.

3. STAA doubles - Wikipedia

   en.wikipedia.org/wiki/STAA_doubles

   Each trailer is 28.5 feet (8.7 meters) long and 8.5 feet (2.6 meters) wide. The doubles are connected via a dolly. This long combination vehicle is the only combination of trailers allowed nationwide in the United States. The axle weight allowed is 20,000 pounds (9,100 kg) per single axle.

4. Roll trailer - Wikipedia

   en.wikipedia.org/wiki/Roll_trailer

   Standard lengths of roll trailers are 20, 40 and 62 feet (6.1, 12.2 and 18.9 m), in line with twenty-foot equivalent unit shipping containers, but can also be found in lengths of 30 and 80 feet (9.1 and 24.4 m). The standard payloads of roll trailers vary from 40 to 120 tons, and the tare of the trailer varies from 7 to 10 tons.

5. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   In Europe, usually only the driven tractor axle has dual wheels, while single wheels are used for every other axle on the tractor and the trailer. The most common combination used in Europe is a semi tractor with two axles and a cargo trailer with three axles, one of which is sometimes a lift axle, giving 5 axles and 12 wheels in total. This ...

6. Truck classification - Wikipedia

   en.wikipedia.org/wiki/Truck_classification

   The typical 5-axle tractor-trailer combination, also called a "semi" or "18-wheeler", is a Class 8 vehicle. [30] Standard trailers vary in length from 8 ft (2.4 m) containers to 57 ft (17 m) van trailers, with the most common length being the 53 ft (16 m) trailer. [31] Specialized trailers for oversized loads can be considerably longer.

7. Vehicle size class - Wikipedia

   en.wikipedia.org/wiki/Vehicle_size_class

   Normal-size passenger vehicles, commonly called "3 number" in reference to their license-plate prefix (trucks and buses over 2000 cc have license plates numbers beginning with 1 and 2 respectively), are those more than 4.7 m (15.4 ft) long, 1.7 m (5.6 ft) wide, 2 m (6.6 ft) high or with engine displacement larger than 2,000 cc (120 cu in). This ...