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Having the rear wheels mounted at the outside edges of the vehicle still adds stability. In the car above, if there were just a single center-mounted rear wheel, it would be at much greater rolling potential. It places the burden of resisting rollover entirely on the front wheels, since a center-mounted wheel just acts as a fulcrum to pivot over.
4-wheels is the superior design for most passenger vehicle transportation needs. It maximizes utility and safety, while not significantly increasing cost.
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