There is a good reason the Dodge/Cummins truck is more expensive that a comparable Ford/Navistar - the Cummins engine is far and away better than the Navistar.

In general the Cummins is not as refined as the Navistar but it is more fuel efficient, has fewer moving parts and is way tougher. The lower end of a 6BT is astonishing - the pistons, connecting rods and crank are two orders of magnitude overbuilt. Its quite obvious these things were made to tow heavy loads hundreds of thousands of miles. The Navistar, by contrast, seems to be built with an eye towards costs....

I have over 100K miles experience with the Dodge/Cummins combo (both old and new body styles) and I'm 100% satisfied with my choice.

Tim