Just wanted to add my experience to the list. I had a 2014 Silverado 1500 with vibrations issues, after 2 years and new tires they were mostly gone. I thought it was a fluke, and at the end of the day having to buy new tires for a leased truck with 20k miles.... sucked. I replaced it with a 2016, which ended up having much more significant vibration. If I had seen this thread I would never have leased another, but I didn't. I live in an area with horrible roads, so can't really test for vibration without driving about 30 miles to find a smooth stretch of interstate. In the past, I never owned a vehicle that couldn't be balanced.
So here's my story.
I'm in Florida, and have the wheels road force balanced at Discount Tire after my first shaky trip from Michigan, did not work. Truck has been shaking since day 1.
Back in Michigan, ask dealer for a road force balance, they do a spin balance and charge me for it. Does not work, and I call them and tell me so.
200 miles later, I'm back at the dealer and they do a road force balance, and charge me AGAIN. I call them on it, and they credit me for the spin balance. Does not work.
I contact GM corporate, and they have me bring the truck back in, spend a week with it, and tell me that 2 of my tires are bad and have to be replaced and that one of my wheels has a "flat spot" that somehow is my fault, and they offer to sell me 2 tires and a wheel for about $1000. I decline, feeling that since the problem has been there since new, it should be their responsibility, and also fearing that it won't help.
After this unsuccessful episode, I contact GM again by email and get no response.
So I have given up, and will live with the shaking for the remaining 2 years, 22k miles on the lease, turn the truck in, and will not buy another GM product again.
Disappointed.