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The 4 wheel diamond allows for mid wheel drive with front and rear wheel steering, and the ability to turn in it's own length. but at speed, with the rear swinging out in a turn, stability is touchy.
The other option is rear wheel drive with front and mid wheel steering. this is more stable, but the Ackermann steering geometry on three wheels is more complex, narrows usable cabin space, and cuts drive traction in half. The only possible advantage I can see is the more gradual spread of the air mass when moving through it.
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