From what I've read over the years, they do tend to be around 4000 loaded and ready to camp.
With the stock tires your rear axle rating is 7400lbs if I'm not mistaken, and around 2900lbs empty with nothing in the bed. This is limited by the stock tires and rims.
That puts you at 3500lbs payload before you hit the tire limits, so you're going to be 500lbs+ over the tire ratings.
You don't want to mess with the tire ratings. Few other components in the vehicle will fail in a catastrophic way so as to put you out of control, but a tire will.
