You found him on this site it looks like

Unfortunately...yes.

Ray,
If you haven't bought a GM truck yet. A little advice... take it for a long test drive on the highway. Their are a lot of issues with vibration at speeds around 70mph +. Look at some of the truck forums about vibration and you will get an idea of what I'm talking about. They are saying 1 in 5 have this issue. Mine is at the dealership again for the third time for this issue and they are having a hard time figuring it out. They have tried balancing the wheels twice. Now they are replacing the drive shaft and front drive axle. They are just throwing parts at it to see if they can figure it out. I'm not alone on this.
Just thought I would share this because it sounds like you plan on keeping it for awhile. I spent $40K+ and plan on keeping it for awhile, if it stays together. I drive a lot of miles so we will see if it holds up.

Thanks Ray for the info. I will check some of the truck forums out.

A friend of mine just bought a lightly used 2013 Silverado. (9k miles) He's only had it five days, but it seems to be a great truck so far. It's V8, automatic, 2WD. He traded in his 2011 GT mustang, before it needed several thousand dollars of maintenance. Plus he is getting to the point of needing a truck.

Now this is a truck! Just got this Sport not too long ago!
http://i1370.photobucket.com/albums/...pswfimya8n.jpg

Only one problem. It's a Dodge. Lol. Had Dodge trucks with Hemi's in them for work for 3 years. Great motor, rest of the truck was terrible.

The issue of vibration has been on the 2014 and 2015 models. I'm sure they all can't have this issue, but I would definitely take it for a good test drive before I signed on the bottom line.

My neighbor Darrel has a 2015 GMC. He had it back to the dealer several times for the vibration issue. They finally sent it to the engineers at the GM proving grounds in Milford. They had it for close to a month. Replaced tires, I think all 4 wheels and at least 1 half-shaft. They got his fixed but I'm not sure they know exactly what fixed it. I think it was the wheels, they were sent back to the manufacturer.

They have had mine for a week. They balanced the wheels twice. They said they are in speck. Now they are replacing the drive shaft and the front axle shaft. I guess we will see if they get it fixed.