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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   After all, the purpose of the fifth wheel is to link the tractor and the trailer; indeed, trailers existed before Charles H. Martin introduced the Martin Rocking Fifth Wheel in 1915. At the time, the fifth wheel literally was a wheel that moved with the trailer—unlike today’s technology that secures a kingpin.

3. Semi-trailer truck - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_truck

   Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...

4. Wheel chock - Wikipedia

   en.wikipedia.org/wiki/Wheel_chock

   Motorcycle and bicycle chocks are bifurcated and fit around the wheel, supporting the bike and preventing its movement. The mining industry uses wheel chocks to protect lubrication trucks and heavy maintenance vehicles from slipping on off-road terrain when placed in Park. The huge haul trucks, which can weigh up to 450 tonnes (440 long tons ...

5. Bogie - Wikipedia

   en.wikipedia.org/wiki/Bogie

   In trucking, a bogie is the subassembly of axles and wheels that supports a semi-trailer, whether permanently attached to the frame (as on a single trailer) or making up the dolly that can be hitched and unhitched as needed when hitching up a second or third semi-trailer (as when pulling doubles or triples).

6. Wheel Horse - Wikipedia

   en.wikipedia.org/wiki/Wheel_Horse

   Under their new owner, economically priced Wheel Horse tractors shared the same pressed-steel frames, attachments, and other parts used in bargain-built Toro family equipment. In fact, even larger garden and compact tractors were "cookie cutter" units identical in construction to New Holland models built under contract by Toro [citation needed ...

7. Tractor pulling - Wikipedia

   en.wikipedia.org/wiki/Tractor_pulling

   The two-wheel–drive (2WD) division was introduced in 1983.. The division imposes a weight limit of 2,800 kilograms (6,200 lb) on each competing truck, a maximum width of 2.4 meters (8 ft), and a maximum distance of 4.6 meters (15 ft) from the centerline of the rear axle to the front of the vehicle (including weight racks and tow hook).