First off, this is just some opinions I have just to be able to add to your thread. I am not overly educated on the subject so none of it is necessarily fact. I think they both have their advantages and disadvantages. In my opinion, an inline motor is probably the better design when it comes to a truck that pulls a lot of weight as its sole purpose. They inherently produce more torque at a lower rpm than a v8 diesel does. However, I don't think they have the RPM potential that a V design can have. They also generally have a very strong foundation by design. I think the length of the crankshaft allows more main bearing surface, but this design also takes up a lot more room and weighs more than our v8's. I'd say a big reason you see the v8's in pickup's like ours is the fact it can compare in size to a gas counterpart. The cummins engine is pretty tall as well as long. Not saying they cant put it in a pickup, as it obviously fits. I think a v8 works well in a pickup application as most people that own them don't need to make power as low as an inline, and the RPM potential makes them very streetable. The are a decent amount of V-design diesels that aren't so great compared to an inline cummins in my opinion. I feel the duramax is the exception, not the rule. It has been well engineered and updated frequently as problems were found.
2002 Silverado 2500 CCSB 4x4 Auto
2003 Silverado 2500LS CCSB 4x4 ZF6 (Sold)