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The area swept by a turning car is symmetrical fore and aft of the rear axle, so overhang, especially if tapered, will not hit stuff.
Most cars can use more tail area for crosswind stability. The center of "lift" is usually about 25% of the way back, since the front is redirecting the air, while the center of mass falls naturally around 50% back. The tail does generate more side force, but it is on the back axle, which has traction that otherwise makes the front end wander. Even with long tails, several streamliners have added a tail fin for stability. More side force, within the ability of the chassis to support it, may even give a boost by working as a wing-sail.
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