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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. Caravan (trailer) - Wikipedia

   en.wikipedia.org/wiki/Caravan_(trailer)

   A caravan is an RV, and going RVing would be caravanning. Most caravan designs would probably be called a travel trailer, or in some cases a fifth wheel or camper trailer. Caravans can go to RV parks or some camp sites— not trailer parks, which usually communities of semi-permanent structures called mobile homes. However, sometimes they can ...

7. Power take-off - Wikipedia

   en.wikipedia.org/wiki/Power_take-off

   A PTO at the rear end of a farm tractor A PTO (in the box at the bottom) in the center of the three-point hitch of a tractor. A power take-off or power takeoff (PTO) is one of several methods for taking power from a power source, such as a running engine, and transmitting it to an application such as an attached implement or separate machine.

8. Semi-trailer aerodynamic device - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer_aerodynamic...

   Semi-trailer aerodynamic devices are devices affixed to semi-trailers, for the purpose of reducing aerodynamic drag caused by air turbulence.The two major types of device in use are trailer skirts (or side skirts), affixed to the underside of trailers, and trailer tails (or boat tails, or rear fairings), affixed to the rear.