I have a 2005 Dodge Ram 1500 Quad cab with the 5.7 hemi and the 3.92 gears. Purchased it new in August of 2005 so it's just over 13 years old. I have 105,000 miles on it and it has been the best vehicle I have ever owned. The only thing I have done to it is tires, brakes and oil changes. I had all the fluids changed at 80k and got the spark plugs changed as 80k as well. The only repair I can think of is I did have a leaky pinion seal that was replaced under warranty. I had two recalls for air bags. It was my daily driver for the first 10 years of it's life and I still drive it a couple of times a week.
I pulled a boat and a 30' travel trailer with it. The TT was probably around 6500lbs loaded and it pulled it great. I live in Florida so most of my towing was in flat lands but the few times I was in the hills it pulled just fine. I got about 9-10mpg while towing. I probably put about 30,000 miles on it towing my 4500lb boat and 6500lb trailer.
Burch