I have the short box 2500 HD EXT Cab 4X4 and like towing my 31' trailer with it. I had to have the short box because of parking in parking garages downtown. The long box would have been too much of a hassle. I wish that the tank was bigger than 26 gallons though. I would like to get the transfer flow tank, 45 gallons, but don't have the extra $1,000 (1 large) laying around
On the other hand, If I use 22 gallons at around 15 mpg towing, that is a 330 mile range. Good time to stretch legs, buy diet cokes etc.
The idiot light comes on in my truck when I have 4 gallons left and I start looking hard for fuel then. I was told never to run a diesel out of fuel...period.
Good luck to you. The F250's are nice.