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2. George Walther Sr. - Wikipedia

   en.wikipedia.org/wiki/George_Walther_Sr.

   George Walther Sr. (August 13, 1876 – April 10, 1961) was an American inventor, engineer, businessman, civic leader and the holder of over 100 patents for truck wheels, brake drums, fifth wheels, and landing gear/legs for the trucking industry.

3. Tractor unit - Wikipedia

   en.wikipedia.org/wiki/Tractor_unit

   fifth wheel coupling 9. enclosed cargo space 10. landing gear – legs for when semi-trailer is detached . Tractor units typically have large-displacement diesel engines for power, durability, and economy; several axles; and a multi-ratio transmission (10, 13, or 18 gears) for maximum flexibility in gearing.

4. Undercarriage arrangements - Wikipedia

   en.wikipedia.org/wiki/Undercarriage_arrangements

   Airbus A380 nose landing gear (consisting of a single 2-wheel bogie) 4 wheels, 2 axles: An Airbus A330's main landing gear (consisting of two 4-wheel bogies) 6 wheels, 3 axles: A Boeing 777's main landing gear (consisting of two 6-wheel bogies) 14 wheels, 7 axles: The Antonov An-225's main landing gear (consisting of two 14-wheel bogies)

5. 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.

6. Glossary of the American trucking industry - Wikipedia

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

   A large pin, underneath the front of a trailer, which interlocks with the fifth wheel. [8] Landing gear A set of retractable, crank-up legs that support the front of a trailer when it is not connected to a tractor. [8] A dump truck with a raised lift axle Lift axle

7. Semi-trailer - Wikipedia

   en.wikipedia.org/wiki/Semi-trailer

   The towing vehicle has a wide coupling plate known as a fifth-wheel coupling bolted onto its chassis, on which the semi-trailer rests and pivots. As the tractor reverses under the trailer, a kingpin under the front of the trailer slides into a slot in the skid plate, and the jaws of the fifth wheel close onto it.