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2. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   Modern fifth wheels allow the trailers to slide into the fifth wheel and lock into it very reliably when maintained and serviced properly. The engagement of the king pin into the fifth-wheel locking mechanism is the only means of connection between tractor and trailer; no other device or safety mechanism is used.

3. Lockrod - Wikipedia

   en.wikipedia.org/wiki/Lockrod

   Powerbrace continues to manufacture lockrods, trailer door hinges, and security lock devices for trailer doors from its Kenosha plant. Trailer doors are secured to the end frame (end wall) of the trailer to make sure the cargo doesn't shift and break down the door, and second, to keep the doors aligned properly by not allowing them to move up ...

4. ISO standards for trailer connectors - Wikipedia

   en.wikipedia.org/wiki/ISO_standards_for_trailer...

   7-pin ISO 1724 trailer connector type 12N (Towing vehicle side). This connector uses a mix of pin and socket terminals. Physical design according to standard ISO 1724. [4] [8] The 7-pin connector uses all 7 pins on newer trailers according to the ISO standard. [9] [10] On older trailers there's sometimes a 5-wire setup using a 7-pin connector.

5. Trailer connectors in North America - Wikipedia

   en.wikipedia.org/wiki/Trailer_connectors_in...

   Flat 5-pin connector (Towing vehicle side) This contact is not as common, but is compatible with the 4-pin connector in the way that a towing vehicle with this connector can be connected to a trailer with the 4-pin flat plug. The extra connection is often used to block the surge brakes when reversing with the trailer. #

6. Tow hitch - Wikipedia

   en.wikipedia.org/wiki/Tow_hitch

   Before 1932, all trailers used only jaw or hook couplings with an eyelet for trailer towing. In 1932, Franz Knöbel, of Westfalia-Werke developed the trailer hitch with a ball head and socket joint. Franz Knöbel patented the ball head-socket joint trailer hitch invention on March 14, 1934. Westfalia holds a number of towing patents. [13] [14] [15]

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