Mine has 7900 lbs axle while Ford rates the axle at around 6200 lbs with only 75 psi in the tires.
My 265/70/17 tires were rated at 3100 lbs at 80 psi. Now figure.
But I did observe that my 75lbs aired tires while empty had 80psi when loaded.
It satisfied me.
Now I have 275/70/18 tires with 3640 lbs capacity at 80 psi. I air them at 70 psi and they look great.
Barbara and Laurent, Hartland Big Country 3500RL. 39 ft long and 15500 GVW.
2005 Ford F250 SD, XL F250 4x4, Long Box, 6.0L Diesel, 6 Speed Stick, Hypertech Max Energy for Fuel mileage of 21 MPusG empty, 12.6 MPusG pulling the BC. ScangaugeII for display..