I did a lot of calculations when I had gotten my (then new) 2010 Silverado 1500; at that time, I calculated that I could safely tow (i.e. have a good towing experience with) around a 5,700 pound trailer (that's laden, not dry.) Ended up getting a 4,800 # UVW TT, and when I took it to a local truck weigh station one day on the way out on a trip (i.e., laden), it weighed in at approx. 5,500 #. It has towed very well for me the last 5 years; haven't tried towing it up any serious mountains like out west, but we've been very happy with the truck/trailer handling where we've gone with it, mainly up and down the East Coast.
HTH,
Will