This truck has problems with its DEF. It's been fixed more times than than any car I have ever had. Yet it's broken again. Way to much trouble it has caused !

I bought this truck to pull my 9000 lb travel trailer, which was wearing out a half-ton pickup. The 3500 pulls it very well. Towing mirrors and brake controller are excellent. Where legal I towed with cruise control at 70 mph on I-80 from Cheyenne, WY to the Mississippi River. The truck did not slow or downshift for a hill the entire way. It got 12-15 mpg. There was absolutely no trailer sway, even without an anti-sway hitch. When not towing, the truck averages 23 mpg at 75 mph, with a range of about 600 miles/tankful. You can hear the diesel engine around town but not on the highway. The ride is heavy-duty, as expected, but very comfortable on the highway. The seats are great. The recommended tire pressure is for maximum load. I run 45 psi unloaded without setting off the tire pressure monitor. The truck rides and handles better that way. Anything I don't like? The headlights come on and the radio/GPS switches to night-time display mode in broad daylight depending on sun angle. I can't see the display while wearing dark glasses when it does that. You can't override this behavior. As for reliability I can't say much because I've only driven the truck 20,000 miles. So far, no issues. A major reason I went with GM was the fuel pump. It's worth researching diesel fuel pump lawsuits online.

I just found out I cant drive this truck when it is raining the way air intake system is designed when air filter gets wet the engine sucks it in to the turbo