Do truck wakes take a quantum leap between 50 and 70 MPH? I remember that having the Car-Cycle with a cover that closed the front wheel arch "spoilers" on a car top would rock the whole car on high speed freeways, but it never moved when being run on the shoulder with 55 MPH traffic passing and the fin in place. Nor do I have any problem in my Geo Metro, which seldom sees 60, but does run on a lot of ice.
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