I've had both a '99 F250 CC SB 4x4 and a 2000 F350 CC DRW CC SB 4x4 with the V10. Both were great trucks and towed well. It is one of the smoothest engines around, but the gas mileage, especially with the Dually was not the greatest. That one never broke into double digits. (Both were 3.73) I saw about 22 MPG with the F250. The short bed looks great but will only get you a 29 gallon tank-there's good aftermarket ones that will replace it to 48 gals.
I now have an Excursion Limited with the PSD and love it!