For the short moves, even a V10 would be fine with a good deep gear set on the rear axle, like a 4.30 or even a 4.56. You don't have to set any speed records if you're only moving it once a month. Just get there in one piece.
The V10 has the advantage of being much better suited to long periods of sitting around, where the diesel is going to fare much better if you work it regularly.
Keep in mind that in 2003, diesels and large-displacement gas engines of the time were about equal in power output. Diesels did not put out 1000 ft-lbs of torque for another 10+ years.
It all boils down to what's available, though. If this 2003 is a good truck and priced right it will do the job, but if you're buying this truck just for the sake of buying a truck, you probably can do better if you keep looking.