Also make sure that the one that you get has the tow package. The extra transmission and oil cooling is nice, so are the bigger mirrors and all the electrical already ran.
The 5.7L Crewmax 4x4 will pull anywhere from 9,100 - 9,800 depending on what package you get. The payload (tongue weight plus gas and everything else in the back) is 1,510-1,555. Gross Vehicle weight (basically your whole truck with people, dogs, and trailer attached) is 7,200 lbs.
So even loaded up you should be fine, I strongly recommend a weight distributing hitch to shift the weight back onto the trailer from your truck.
2016 Dutchman Denali 287RE
2008 Toyota Tundra Limited