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Has anyone looked into bringing your pivot point up to about mid vehicle height and joining the two shapes with a ball and cup joint for minimal aerodynamic disturbance?
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I've thought about it. And also a variant where the hitch height is raised to minimize the accordion pleats required.
My conclusion was that the hitch height needs to be about the level of the rear axle. Higher and the lever arm will load and unload the front axle. Same with a 5th wheel; if you move away from the axle line it will induce self-steering.
In my mind, anyway. So—a half-ball and socket centered down low. Keeping it small would minimize the cavity in the tow vehicle, which would require the depth (behind the hitch) to be half the width.
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I wonder about half-circular overlapping plates like an Armadillo.