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The extended jack must be designed to take a degree of fore-and-aft loading as the load will only be purely along the tube when the tube is at right angles to the ground. When the tongue is raised right up, so as, for example, to fit the load distribution bars, there will be a considerable fore-and-aft bending moment, and the jack tube withstands this. I would not be concerned about this.
Nick.
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Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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