Again, it all comes down to CDL requirements.
ANY vehicle that has a GCWR of over 26,000lbs cannot tow a trailer over 10,000lbs without a CDL-A license. So if you want to obey the law then that Ford with a GCWR of 29k,30k, or 33k lbs can only tow 10,000lbs
UNLESS YOU HAVE A CDL-A LICENSE.
That
Dodge RAM with a 26,000lb GCWR can tow it's full capacity of 17k lbs WITHOUT A CDL.
Ford Super Duty's only have a max tow capacity of 15.7k lbs when under 26,000lbs GCWR. Their GCWR goes from 23,400 to 29,000 with nothing in between.
Like I've said a million times, it a numbers game that Ford likes to play and unless you have a CDL or don't want to obey the law then you can not haul as much as they make you think you can. Of course if you do get that CDL license then the higher GCWR comes in handy.