1000 miles on 2015 Silverado 6.2/8 speed

Have just over 1000 miles after 2 weeks on my new 2015 Silverado LTZ 6.2 w/ max tow. Pretty simply, there isn't anything I don't like about it. Took a trip to Carlisle PA. last week and got 19.5 mpg with 300 miles on it. It's getting 17.8 with a combination of city and highway. Truck is VERY quiet. Tons of power,(I've had a 6.2 before).So far,so good with the 8 speed. It's behaving very well and not "hunting' at all, however there is an occasional "clunk" when accelerating from a sharp turn. Much like some other GM trucks I've had in the past. The biggest jump by far in refinement of Chevy trucks I've had over the years. I ordered it because there was no way I'd ever find what I wanted and didn't want on the lot. It's an LTZ only because that's the only trim the 6.2 comes in. I also excluded quite a few things that you would typically find on an LTZ. By researching the GVWR and payload numbers, I figured it would have around 2000lbs of payload. It came delivered with 1987lbs.