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I would expect that anything sticking up above the rear wheel's contact patch would have significant leverage, and would easily force the cycle to lean drastically with any type of side load - the taller it is, and the farther behind the contact patch, the more effect it would have.
On the highway, passing a large truck, I would think the air deflected off of the front of the truck would give you a significant sideways thrust and cause a dangerous handling condition with any type of rudder system.
In Land Speed Racing, rudders work because they add straight-line stability, and the amounts of side loads are insignificant compared to the forward velocity (as sendler noted above).
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