I actually found a place in a magazine that was making the perfect tow rigs, Taking a Ford 250 or 350, pulling out the problematic 6.0, and putting in the cummings from the Dodge.
So you get the well built truck of the Ford with a decent tranny, with the power king, great gas mileage and durability of the Cummings Turbo Diesel,
Whats a shame is for along time, and maybe still, FOrd owned Cummings but an older contract with Dodge kept Ford from using them in their trucks, so they went with an International Harvester, and problems began.
The 2006 model year 6.0 diesel would be the cream of the crop, the reliability rating was higher than the 7.3, and it was before the emissions standards changed in 07 and gas mileage dropped way off.
I wouldnt buy a 6.0 without a real good warranty.
The main point is just about any 250/350 truck you find will do what you want. 150 classes need to be checked to make sure they are set up properly as you will find ones that can and ones that can't.