I have a 2014 Silverado double cab. It had a slight vibration around 70 mph when new, now it has 2800 miles on it and the vibration is gone. Rides and drives perfect.
One other comment, I recently had the chance to drive a friends new 2013 Ram Big Horn. There is no comparison when it comes to ride and drive...IMO The new Silverado rides and drives so much better. Truth be known, my friends Ram reminded me of my old 2006 GMC truck. Vibrations in the cabin and cowl shake, along with sloppy brakes, vague steering and body roll around corners. I assume Ram will catch up in the next 8 to 10 years, if Fiat doesn't kill the brand off before then.