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There is a really important difference between a narrowed rear wheel track - and a single rear wheel. A single rear wheel will be unstable in all likelihood as you've drawn it - the tail should be a fish tail if you have one wheel so that there is no weight outside the triangle formed by the contact patches.
The Dolphin has much more side taper (which is good) and the wheelbase is extended, as well as keeping four wheels, all making it stable.
Take a look at the Aptera - the front wheels are SEVEN FEET apart and when the battery is kept near the front wheels, it was stable, but as weight crept toward the back (and got much heavier) it required extraordinary effort to keep it stable.
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