How much can we REALLY tow with our 2015 Sierra 1500?

You're getting a lot of comments about dry weight and rightfully so but there are two "dry weights." The brochure number which is irrelevant for all the reasons given above and the sticker on the actual TT that gives the weight when it left the factory. You want the latter and the GVWR.

Again, you need to do your math but I bet you'll end up happier if you are in the 5,000 dry, 6,500/7,000 lb GVWR range.