cp1969,
There definitely would be a market for such a machine. Since Peterbilt and KW really seek high levels of customization in their products, I believe a pickup would be the same. For years, I heard friends of mine say "I will never pay $50K for a pickup!" and yet, I see many of them driving their King Ranch Fords, or high-level Duramax's or Cummins machines down the road, any of which can be spec'd to over this price. What is another $15-20 K in this sense, (or nonsense)? I believe putting a Caterpillar motor in any truck would make it sell, but truly, how many of us would use one to its limit? The truth is, in 2007, owning and operating a diesel pickup is NOT an exercise in frugality as it used to be. Most of us, myself included, paid a premium for an engine we do not come close to utilizing most times, but yet we still do so. Our local dealer, who sells more heavy duty trucks than any dealer in a several state area, estimates 90% of its 250 and above sales in pickups are diesels. Ford's own demographics report for the new 2008 model 6.4L indicates they expect 95% of all heavy-duty truck buyers purchasing Ford will go diesel in this line of trucks. I have a good friend who sells almost all the heavy duty pickups at this dealership and when I asked him how many of those buying actually need a diesel, his answer was, "None of them." He, himself said he would buy gas next time he purchases a pickup. Most of these diesel trucks will be over $50 K. This leads me to believe most of us (again myself included) still buy our "work trucks" with our hearts, not our heads. So, in response to your question, I think for one, there would be plenty of market for a $60-75K truck from one of those manufacturers.
John M