2012 Ram 2500 CTD. I only have 42,000 on it. Besides a couple recalls which seem to affect everything these days it's been virtually trouble free. I had to clean my EGR valve. No biggie, only took about 1hr to do besides the soak time.
42,000 doesn't seem like much but I only use it for part of the year to tow our 5th wheel and the rest of the time it's a short errand daily driver. Even with the pre DEF it does fine with short hops.
Hard to complain with 4.5 years of use and no major problems and only the EGR valve cleaning.