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All one needs is a test trailer and a custom receiver hitch. Scientific equipment uses a ring that deforms with a sensor to accurately measure when it goes out of round. So the [removable] hitch would have a ball on one end and a Class 1 or 2 tongue on the other. As the [thick steel] ring in the center goes out of round it's width narrows.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Two wrongs don't make a right, but three lefts do.
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