I'm in the same boat. I'm gonna buy a new truck. Here is what I looked at so far and opinions.
Nissan with Cummins motor. Nice truck, interior was good and features were mostly what I would expect. No 8 ft box with a 4 door cab. Cant tow or stop enough trailer weight for me so I could not buy this truck.
For f350 diesel single rear wheel. Nice truck on the inside. Price was a lot compared to the last time I bought a truck. $83k with the equipment I thought I wanted. Will pull everything I need and can fit 3 car seats easily in the back seat.
Dodge 3500 Cummins single rear wheel. A little to Gody of an interior. Nice truck. Has all the features I want. Was about 15k less than the Ford and was offered in a manual trans which I like. They also offer a mega large cab which I liked but then no 8 ft box which is not an option.
GMC 3500 Denali single rear wheel. This truck seemed the nicest and tightest. Turned better and held the road well. Interior was lacking at 78k to be honest. I looked at a Chevy and they are basically the same and I assume cheaper. I do like it the best currently but am waiting to see what the 19s hold.
Overall after driving all 3 I like the GMC the best. Waiting to drive all 19 models but I will follow this thread to hear what others have to say.
Good luck!