When I had my long commute, I used to do that on the 60 freeway. Of course, all traffic was moving at 45-55 mph, and I'd stay several car-lengths back. My concern wasn't so much that the truck was going to slam on his brakes, but that he'd see a wooden apple box or something and just high-center it, leaving me to eat it. However, since he was following other cars, it seemed less of an issue. (I could tell if they were swerving out of the lane to avoid something.)
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