The tire issue not withstanding, swing axles are an old enough design that few now have experienced the vicious and violently sudden oversteer, followed by the rear wheel tucking under, followed by a snap rollover, that they can induce. There is no warning, you reach the point under control, the axle folds under, and over you go. If you are lucky, the rear end just hops in to the air one or two feet. Anyone who has driven an early VW Beetle, and early Triumph Spitfire, or an early Chevrolet Corvair may have been lucky enough to have survived this. There is a reason all those vehicles had redesigns to counter this, and folks stuck with the originals resorted to things like lengths of steel chain to restrict axle tuck under, and hopefully just result in a big tail happy slide. So I find no fault with the driver, it is an experiment that almost always is going to have this outcome, just an old technology that needs to be experienced once to cause the appropriate caution the next time on swing axles.I would have thought perhaps the driver would have had enough automotive carnival driving experience to know to "turn towards the tilt" once up on two wheels, as that will bring it back down on the tires, hopefully without damage.
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