I had a WW 33' fifth wheel, with a 2006 F250 6.0 6" lift and 35" tires, had a SXS, and 2 quads loaded up with 150 gallons of water and 60 gallons of gas did great.
I have a programmer, cold air intake, and a aftermarket exhaust, but that was just for more power.
have no idea what it weighed, I am sure like MOST I was over limit