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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   The automatic semi-trailer coupling patented by Fruehauf dominated the semi-trailer market until the Fruehauf Trailer Corporation's assets were sold in bankruptcy to Wabash National in 1997. Another fifth wheel patent U.S. 2,053,812 [ 9 ] was issued to Charles E. Bradshaw of Wellville, Virginia , filed March 18, 1936 and granted September 8, 1936.

3. Bogie - Wikipedia

   en.wikipedia.org/wiki/Bogie

   Articulated lorries (tractor-trailers) [ edit ] 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 ...

4. Articulated hauler - Wikipedia

   en.wikipedia.org/wiki/Articulated_hauler

   The vehicle usually has all-wheel drive and consists of two basic units: the front section, generally called the tractor, and the rear section that contains the dump body, called the hauler or trailer section. Steering is made by pivoting the front in relation to the back by hydraulic rams.

5. Level control valve - Wikipedia

   en.wikipedia.org/wiki/Level_control_valve

   A level control valve or altitude control valve is a type of valve that automatically responds to changes in the height of a liquid in some storage system. A common example is the set of ballcocks in a flush toilet, where each stage of the flush cycle is actuated by the emptying or filling of the tank.

6. Relay valve - Wikipedia

   en.wikipedia.org/wiki/Relay_valve

   A relay valve is an air-operated valve typically used in air brake systems to remotely control the brakes at the rear of a heavy truck or semi-trailer in a tractor-trailer combination. Relay valves are necessary in heavy trucks in order to speed-up rear-brake application and release, since air takes longer to travel to the rear of the vehicle ...

7. Dump truck - Wikipedia

   en.wikipedia.org/wiki/Dump_truck

   The frameless dump trailer has no frame under the trailer but has ribs that go around the body for support and the top rail of the trailer serves as a suspension bridge for support. The difference in structure also brings with it a difference in weight. Frame dump trailers are heavier. For the same length, a frame dump trailer weighs around 5 ...