I'm pretty sure the math is wrong regarding how you weigh with a lever and a scale. The tongue is the fulcrum. If there are 3 feet between the tongue and the scale, and one foot between the tongue and the supporting pipe, the scale is bearing 1/4 of the weight and the supporting pipe is bearing 3/4. So you still multiply by 4, but that changes if you move the fulcrum along the lever.
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