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Solid rubber would be too firm, I think? They would either get torn/scratched/damaged or they would try to lift the car. Hollow or made out of foam rubber with a tough surface would be the ticket, if you want them to be closer to the ground than some places would rub them.
Remember, the bottom portion of the wheels is virtually stationary vs the ground, even when the vehicle is moving, so leaving enough of the wheel exposed to keep the strakes from hitting even on driveway aprons or speed bumps is a case of diminishing returns.
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