"I'm @ 60K on my 2014 6.4 Hemi, 3.73 gears and tow an 11K 5th wheel. I'd say the truck is good not great.
While towing - Gear ratios in the tranny are borrowed from the diesel and pretty much suck for this truck. Also, the tranny has some really annoying/stupid shifting behaviors. Most of that can be worked out with manual shifting. The ratios really leave a large gap between first and second. You are often stuck in no man's land trying to go 30-40 up a steep/winding hill. The tranny drops into 2nd but quickly slams back up into 1st.
I know I'm pushing the upper limits of the truck and have the less ideal gears. Even with my complaints it's not like I don't eventually get where I'm going or I just hate the whole experience. It just could be better. If starting from scratch I'd sure be looking long and hard at the Ford 6.2 with 4.30 gears (and presumably a tranny that wasn't designed by an intern).
As a daily driver the truck is near perfect. Also, Ram does give you more for your hard earned money than the competition so it's a tough call. If I towed more frequently, and at the weight I'm towing, there's no way I'd keep this truck."
I second everything said here. I towed a slightly heavier 5th wheel but my truck had 4.10's. The transmission is the down side of the truck. The truck did its job, and did it well on flat land. I towed a smaller bumper pull with a 1500 5.7 and a 2500 6.4. Completely different experience. I would never go back to pulling and travel trailer with a 1500. The trailer I had was only 26ft and 6000lbs, but the 2500 did so much better job and made it so much more comfortable. As far as the motors, you really cant compare a 5.7 in an 1500 and 5.7 in a 2500. They have different power ratings because they use different cams. The 2500 5.7 has lower power ratings than the 1500 motor but a much flatter curve. The 6.4 has a very flat curve and produces a fair amount more power than a 2500 5.7. I personally think Ram makes the nicest truck out there, they ride better and the creature comforts inside are nicer. However the transmission gearing can be enough to make you slap your head at times. The gearing choices in the 2500 gas tranmssion are stupid compared to what GM and Ford uses.