Having an 07 Dmax, I like it. There are some quirky things about it, but I don't know if it has had more problems than my friends' Dodges.
What is bad is that the water pump tends to fail punctually at 160K miles, but it fails slowly giving you lots of warning (leaking) giving you time to get it into the shop.
The other weird problem on the 3/4 ton is running it at high altitude, load, and heat. There can be an occassional problem where the engine will flip into limp mode because the fuel hose can get soft and start to collaspe starving the engine for fuel. Let it cool for a couple of hours and the problem will self fix and the shop won't be able to locate the problem!
Another problem on the 3/4 ton is the primer on the fuel filter. Every few years the rings start to leak and you will need to replace them. The new assy cost about $900, the rings cost $13 and take an hour to replace. Fairly easy to do.
The solenoids on the 4 wheel drive system can get weak. Those are about $250 in parts, and if you have a lift can be replaced in about 1 or 2.
Beyond that it runs pretty darn good, and better than my friend's younger Powerstroke. (leaky injector bent a piston rod).
My mechanic tells me that today he could get me what I paid for it used years ago because some people want that LBZ engine. My mechanic also says I have another 250K-300K miles left in it.
What I will say is that there is nothing like 4WD and a turbocharged diesel for towing, even though I could probably pull the current RV with a gasser.
