Stephen 
2016 Nissan Titan XD Diesel PRO-4X 4dr Crew Cab 4WD SB (5.0L 8cyl Turbodiesel 6A)
Just a test drive, but WOW
 I've been test driving lots of Trucks, I'm not ready yet. (i'm one of those shoppers sales guys hate).  I've reviewed a lot of the Trucks I've test driven including some of the Diesels and some gas engines.  This one is at the top of my list.  It's definitely not cheap, but after test driving it I learned why and YES, I'm willing to spend the extra $$$ on this one when my time comes.  It's as smooth as any of the gas engines I drove including the Tundra and Silverado, but has the torque of a Diesel.  In fact, I think it's smoother than the Silverado.  What I noticed about it is the suspension is so soft and smooth.  I don't have to have a 10K lb trailer behind me to give me a smooth ride like I would in a Duramax or Powerstroke.  It's your every-day diesel.  I can't think of anything negative about it.  Sure it's not cheap, but good things never are.  Worth a test drive.