I have a very similar truck, with an RV that's shorter, and lighter by over 1k lbs.
I have no issues. That said, I wouldn't really want much over that.
10% tongue weight is low. Most want at least 12-15%
You'll be at least 1k lbs on the tongue, and over 400 in the truck. You'll have maxed out your payload.
Some old school guys will say don't worry about it, it's just an arbitrary number. Others will say it's dangerous and how dare you drive on the same road as me.
All I know is, with my truck, I'm happy I don't have a larger TT. I have no issues myself, and don't want the hassle of more weight or length.