[Motor31]

The F250 and F350 do have the same weight ratings, up to a point. That's where the F350 continues to have a higher capacity.

Per the 2007 Trailer life towing guide, 5th wheel category.

F250 / F350 combined go to a max of 15,500 lbs with auto trans and 3.73:1 drive

F350 goes to 18,800 lbs with auto trans and 4.30:1 drive.

If both models had the same ratings all across the board there would be no reason to have both models in the line.

The F250 is not rated to haul the 38' MS rigs empty (16,500) or the 36' MS rigs loaded to max weight.

Adding air bags, chips, transmission mods or larger wheels / tires does not change the weight capacity of the tow vehicle. Only the factory is authorized to make a change in the capacity.