The truck now has 25,000 miles give or take. A few additional updates:
The fuel economy is up. Towing average is around 14 now. Empty is averging 16-17.
The transmission has had multiple reflashes to get it shifting properly. Its much better, but far from perfect.
Nissan has a ton of torque managment in this truck.
Silly things like the tailgate release, a window motor, and a seat belt latch had to be replaced. Typical first year bugs in a new model.
At 15k miles I was ready to trade it off. Now it has settled down and I have changed my outlook. The truck has not given us any trouble lately and the ride, the brakes, and the overall comfort is really good.
The Cummins ISV could be a great success if regens, egr, and urea wasnt part of the package. Double overhead cams, aluminum constructed heads and the fast spooling twin turbos are a great design.