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Highway scales are also inspection points for tires and other items on the rig. I believe that it's a requirement for the tires to be visible for a drive-by inspection. A quick thwack with a breaker bar is also a reasonably good test, from what I'm told from several friends who drive. That may be the concern for the wheel covering.
That doesn't preclude trailer fairings from being installed, or aerodynamic cab designs...
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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