Congratulations on the new TT, and welcome to the forum.
Yea, Traveling Texan and Wired George, are just looking out for your safety, and get a bit zealous at times.
Truck prices are starting to come down, and likely to best order if you are looking new, as you can get a better price and what you want.
Seeing how you put a class 4 receiver on your truck, I assume you may also have LT tires.
The Dry weight of 7,300# gives you a bit to work with, if you travel light, might come in at 8,300#+/-. You are going down the right path weighing after loading, to see where you are at. Don't go light on the hitch weight the percentage needs to be 12% to 15%, otherwise it will cause sway.
I will agree with the others skip the 250/2500, and get a 350/3500 with the highest GVWR you can get.
Enjoy your new rig. Let us know what you find for a new TV.