I have a 2011 F250 with the camper prep package which includes the overload springs, sway bar, and upgraded springs in the front. I looked at the F350 and it has the exact same suspension, including the overloads. So, if each truck had 3,600lbs in the bed the trounce stop would almost touch. So if the F350 indeed has a stronger axle, what good would it do because nobody drives around on the trounce stops because you wouldn't have any travel. I believe they are the same based on some part number research I did, but people still argue. The F350 axle rating is only higher for commercial towing. I also added 5k air bags and Superspring Sway Helpers. My rear end is like a pogo stick without a load, but by god it will haul.
It really comes down to the tires when the suspension is beefed up. The F350 I looked at only had 3,410 rated tires while my 250 has 3,640. Therefore I would never go over 7,280. That's a real number.
