I too have a F250 SuperDuty 7.3 diesel, and I know the limitations of the 3/4 ton trucks in the ability to handle kingpin weight. I recently purchased a 2015 Grand Design Reflection 323BHS bunkhouse--37' with 4 sliders.
The fifth wheel weighs 11K, and the pin weight is 2K. That's about the maximum weight I really wanted to tow with my truck.
Grand Design is a 2 year old company, and they're coming on strong. My trailer tows great, and it's as nice of a rig as I'll ever need. I ordered mine with the SuperSofa, which is 12' of leather sofa/recliners--and the most comfortable RV seating I've ever experienced. It's just a great designed trailer and it wasn't pocketbook breaking either.
My best advice to anyone with a 3/4 diesel is not to buy too much trailer for your truck. It's also very important to have the wheels aligned yearly watching for wearing parts, etc. And by all means, keep your brakes and tires up to 100% condition.