I have a 2006 F250 4x4 Diesel crew cab. Max tow capacity is about 12,500 pounds.
I'm towing a 25' South Bay tri-toon with a Volvo 5.7 inboard/outboard on what is supposed to be a very nice trailer made by Extreme Custom Trailers. It's a dual axle with 4-wheel disc brakes...blah, blah, blah...