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2. Trailer (vehicle) - Wikipedia

   en.wikipedia.org/wiki/Trailer_(vehicle)

   The basic function of a trailer jack is to lift the trailer to a height that allows the trailer to be hitched or unhitched to and from the towing vehicle. Trailer jacks are also used for leveling the trailer during storage. The most common types of trailer jacks are A-frame jacks, swivel jacks, and drop-leg jacks.

3. Recreational vehicle terms - Wikipedia

   en.wikipedia.org/wiki/Recreational_vehicle_terms

   On a fifth-wheel trailer these are two jacks that are usually coupled together and are motor driven, that lift the front of the fifth-wheel trailer up so that the truck can be driven under the front and hitch-up. Once hitched up, the landing gear jacks are raised to their stowed position for traveling. Leveling jacks

4. Jackknifing - Wikipedia

   en.wikipedia.org/wiki/Jackknifing

   When a trailer skids to one side, this is known as a trailer swing or trailer slew. This can occur on a slippery road surface, often where there is a cant . This is not the same as jackknifing and is not as serious, as the trailer will move back into line as the vehicle continues forwards.

5. Jockey wheel - Wikipedia

   en.wikipedia.org/wiki/Jockey_wheel

   The screw jack can then be used to lower the trailer nose onto the tow ball. Once securely attached to the towing vehicle, the jockey wheel's jacking action is fully retracted for stowage. The jockey wheel can also be unclamped and lifted as far as possible to give the greatest ground clearance before reclamping prior to a journey being made.

6. GM recalls nearly 500,000 pickup trucks and SUVs. Here's what ...

   www.aol.com/gm-recalls-nearly-500-000-160625464.html

   While towing 8,000-lb trailer going up a small grade, the truck shuddered then immediately downshifted violently, causing the truck to skid and almost jack-knifing the truck and trailer," read one ...

7. Fifth-wheel coupling - Wikipedia

   en.wikipedia.org/wiki/Fifth-wheel_coupling

   A wheel would be placed on the rear frame section of the truck, which at the time had only four wheels, making the additional wheel the "fifth wheel". The trailer needed to be raised so that the trailer's pin would be able to drop into the central hole of the fifth wheel. Fifth wheels were originally not a complete circle and were hand forged.