Here are the numbers on the 09 322FKS
Unloaded Vehicle Weight (lbs.) 7,930
Dry Hitch Weight (lbs.) 1,155
Gross Vehicle Weight Rating (lbs.) 10,250
Cargo Carrying Capacity (lbs.) 2,320
Exterior Length 33' 11"
Exterior Height with A/C 134"
Interior Height (living area) 81"
Fresh Water Capacity (gal.) includes water heater 50
Gray Wastewater Capacity (gal.) 85.5
Toilet/Black Wastewater Capacity (gal.) 48.5
Welcome to the forum, 08 Sierra!
As an owner of a truck with 5.3l, 3.73 rear and HD trailer package I have to be honest and say those numbers in the 322 Eagle specs are quite a bit for the truck, even if it is newer and with a larger tow rating. The dry hitch weight is a concern for the limited payload of the truck, and the loaded hitch weight will be considerably more. The empty and loaded weights could easily be pushing over your tow rating as well which should be in the owners manual or available online. In summary I think some research into what you can safely tow would be prudent.
Here are a few links that may help with understanding weights and ratings
What is my actual tow rating?
Weight terms and definitions:
Measuring tongue load