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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.
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.
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
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A 2.5-ton house jack that stands 24 inches from top to bottom fully threaded out. A house jack, also called a screw jack, is a mechanical device primarily used to lift buildings from their foundations for repairs or relocation. A series of jacks is used and then wood cribbing temporarily supports the structure. This process is repeated until ...
Lufkin Industries is an American manufacturing company founded in 1902 and headquartered in Missouri City, Texas.Lufkin is a provider of rod lift products, automated control and optimization equipment and software for rod lift equipment to the oil and gas industry.