I have a 2015 F350 with the specs you want....we just rolled 10k mikes and she is strong....our Voltage 3950 left us with 1000lbs CCC when hitched up (people and dog included), but we added a Transferflow tank in the bed and the truck gets fueled based on how much we weigh for each trip. She is a beast, but a great vehicle to drive.
I chose this 350 because it basically mimics a 450, but with cheaper insurance, registration, and tires (don't need the bigger commercial tires).
The wide stance front end makes people stand with their mouths open, I can make some nice u turns.
Cale