A guy at work pointed this out to me. If you watch closely, in video #5 of Chevrolet's HD truck HD2HD video series, the Ram truck changes from a single mirror model to a dual mirror model. Which means that Chevrolet isn't showing just vidoe of the official test, but is also showing video of another vehicle.
The single mirror shot can be seen at around 3:30, the dual mirror can be seen in a few shots, this one is at 3:52
In general, I think the whole "passing the truck before hitting the slowpoke" thing was pretty lame, as in contrived.
Also, for some reason, videos #1, and #2 are now missing from YouTube.
