I've never run into that vibration on my '08...but I bought it used, and in perfect condition.
So would this most likely mean the original owner had it serviced for this known issue?
I will raise it with my next service in any case; its minor, but its an imperfection. I bought the truck new, have a 5 years unlimited mileage warranty, and go a 5 years service contract... better use it to full extend.