HungryMedic
That doesn't look too hard... What could go wrong?
We use Chevys and dodges at work. The new Chevys run like a bat out of hell and the dodge is a torque monster. DD I'd expect 15-16 out of a modern 4x4 diesel. Add exhaust and programmer and you boost mpg's and power. Your general cost of ownership will be more with a diesel. But by the time you factor in the f-250 note and insurance and the FJ note and insurance into a new tow rig you will come out ahead. The Chevy 2500 gas with the 6.0 is a good motor, and the 6.2 from ford is a good motor too.