The Ford towing specs for a 2017 F350, dually, diesel, crew cab, fifth wheel are the following:
3.55 ratio, 27,300 lbs.
4.10 ratio, 27,800 lbs.
It also stated that the tow rating is limited to the 5th wheel hitch rating of 27,500 lbs. I'm assuming that is for the factory ordered hitch.
These...