6000 lbs without a weight dist. hitch. 8600-8900 with a WDH. However, it all depends on Tow package, 4x2 or 4x4, and whether or not it has air susp in the rear.
I was right at, or a little over 6000 lbs with the boat, and it handled it without any issues. I even had the tongue weight at 850...