I have had a very good experiance with my Ford F-350 Superduty 7.3 liter diesel. It has a full box and 4 doors making it very long, but for hauling 5th wheel trailers it works flawlessly. Empty I get 18 mpg; with a 15,000 lb. trailer 10 mpg; with a 30,000 lb. trailer 5-7 mpg (yes we have pulled 30k lb. trailer several times, once even a truck plus trailer weight of about 39,000 lb.). One problem with its own weight being almost 8,000 lb. empty, if you ever leave solid road surfaces you will need 4WD. All around though I would say it is an amazing truck that redefined the pick-up-truck.
Turbo Diesel! Massive rear seating, crash safe, pulls like a 'freight train.'
More direct floor heat (it blows on your ankles instead of your frozen feet!). Rear floor heat from under front seat. Sun/moon roof in 4 door models - why not?