I should keep my mouth shut, but...
After owning 3 Dodge diesels, if I ever buy an American diesel truck again it will be a GM w/ a Duramax. The only thing the Dodges have going for them is the Cummins, the rest of the truck is severely lacking IMO. My '03 Dodge was the biggest pile of sh!t I've ever owned (and that's saying a lot), there were times I wished it would have burned to the ground.
I'm not a Ford fan, but those older trucks with the 7.3l are pretty good trucks, all the high & low points have been hit on so no need to repeat what has already been said.
Here's to hoping that someday Toyota will bring over a Hino diesel in the Tundra.
If you can live with a gasser truck, the GM 6.0 trucks are pretty decent, for gas. I wouldn't even think about trying to tow with the older Chevys, especially with the TH400. I owned a 3/4 ton Chevy, TBI 350, TH400 and it drank the fuel like crazy. Just driving around town and not really going anywhere, I was filling the tank every 3-4 days... at $50 a tank.
I owned that truck for less than a month before I decided that was a bad idea.