Well, they do and don't.
They're more interested in downforce than anything else, which is nice for when you're going 200 MPH around a corner, ya know?
I'll try to find it again, there was a webpost somewhere (that I probably didn't save) which detailed the Cd and A of the newest NASCAR vehicles, including the trucks. IIRC, they were about average for our purposes, but can make 1,000's of lbs of downforce at speed.
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