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If I had pursued this further, I would have gone toward a Vespa motor scooter front axle, with it's side-arm brake and suspension.
I wasn't sure whether the offset between the horizontal and vertical axis is important to your design or not. I leaned toward an horizontal hinge at the bumper and another hinge at the axle. If it was to fold up, the wheel would be on a 4-bar linkage.
Another possibility might be two vertical hinges, with [a] control arm[s] to control the side-to-side excursions. I'm not sure how that one would back up, it might want to jack-knife.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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