The tongue weight is estimated at 10%. Only once you set it up for your situation will you know for sure. Normally a TT has a tongue weight of 12-15%. The yellow sticker on the RV may or may not include the battery and propane tanks on the front. Most times they do not.
You'll probably be fine, as I didn't notice at first that GM upped the GVWR of the new trucks or offered the NHT pkg with the 5.3. Mine was only 7200 GVWR and NHT was not offered unless you got the 6.2.
I just want to share my experience to keep others from making a similar mistake. I simply bought too much trailer for my truck even though it was within the mfg tow ratings. At first I was excited about the diesel, but over the long term I'd rather have a 1/2 ton as the 2500HD is not the best daily driver but I needed to be safe and we liked our TT. Fortunately, two 3000 mile plus summer trips have made me happy with my overall decision.
