Well here is my $. 02. I went to John Deere Tech school were in engine class the teachers stood up and said cubic inch for cubic inch a inline produces more torque then a V. That being said if you were buying a 1/2 ford truck several years ago and you could choose between the 300 six to the 302, the six would out torque it any day and ususally get better economy.
Second, what application besides chevy, and ford pickups where does a v8 diesel reside? Cat, Cummins, Detroit, John Deere, International, etc have tried v8 and don't anymore, the inline 6 is the way to go when it is time work. Just look at all the new over the road trucks, ag tractors, bull dozers, loaders, etc,etc. Only do they go to the v design when you have to have HUGE quanities of cubes and hp ie v12, v16, and some space requirements, in the HUGE loaders, dump trucks, and generating stations.
Yes if we are drag racing a v8 with some revs is the answer, but when its time to work its time for a 6 cylinder.
Now my opinion on the truck, there is only one choice for me to get a diesel. Dodge, cummins, 6 spd, 4X4, thats what I would get, no v8, no independent front suspension, no auto, for me its a nobrainer! I don't concern myself with fit and finish, heck I'm still driving a first gen. Its simple, reliable, tuff drivetrain,(I can't even complain about the getrag!) and it pulls alot petter than my newer, lower geared, smaller tired, FORD powerjoke work truck, and it has 60,000 miles less on the odometer. Got to have rpm to get any power, it doesn't pull bottom to top in the prm range like my cummins does. (Obviously no my choice, the boss' boss made that one)
AGAIN THIS IS JUST MY OPINION! and you must remember opinions are like armpits, everyone has them, and some of them stink!!