Hi,
The 1995 - 2004 F-250 had a meager 8,800 pound GVWR, so at least you have the 10,000 GVWR and a gas truck will weigh around 7,000 pounds empty with 2 WD and regular cab, so you have plenty of cargo capacity. With the crewcab, (about 400 pounds) diesel engine (about 500 pounds) and some other options, your base weight might be pushing 8,000 pounds. That only leaves about 2,000 pounds for all the cargo and passengers.
So it depends on your curb weight. 10,000 pound fifth wheel with 20% 2,000 pound pin weight will limit the amount of passenger weight that you can add, and limit the things you might otherwise want to carry in the truck.
Also the 2007 PSD needs a water coolant filter. Napa #FIL4070 will work fine, and kit #FIL 4019 to install it on your heater hose line.
Your truck will "pull" a 15,000 pound trailer, but not a 15,000 pound fifth wheel with a pin weight greater than about 1,800 pounds. That is the limiting factor, so about 10,000 pounds is what is practical for your 1,800 pounds of cargo rating above your current curb weight.
Check the curb weight for YOUR truck, it might show you can carry more or less weight. You can tow just about any travel trailer, they only have around 1,200 pounds max hitch weight.
You can find your towing guide here.
http://www.fleet.ford.com/towing-guides/Good luck,
Fred.