Builder,
What equipment are you planning to haul with this and what does it weigh?
I used my F550 to haul some ornamental rock with the 14k dump trailer this weekend and it did a great job. First time I had a real load on the trailer to try it out, my total gross weight was around 25,000 lbs and no problems pulling up the mountain roads here.
Planning on a 24-25K 30' dual tandem gooseneck to haul tractor & batwing....about as much as the truck is rated to handle. Truck should weigh ~8,000lbs empty (based on a guess from what my old F-450 4x4 dumptruck weighing 8,400 empty).
GCWR is 33,000lbs. If 550 weighs ~8,000lbs, that takes me down to ~25,000lbs. Trailer will probably weigh 7,000 lbs. That will leave me a max payload of 18,000lbs. That will allow me to carry my farm tractor & batwing easily (14,000lbs) or a light backhoe or my mini-ex and a skid steer.
All guesses at this point. I will weigh truck as soon as I get it back from dealer.