I can comment a bit based on my experiences and research. I have a 2016 1500 with the ECO-Diesel and I tow a (dry weight) trailer of 6400 lbs. The trailer has a 750 lb tongue weight.

The first thing that I found is that the newer RAMs are actually rated at over 3/4 ton versus the 1/2 ton category they're in (1500 model). I found this after I noticed newer RAM 2500s with similar trailers to mine, had a similar ride height after being hooked to their trailers. My ride height (with trailer connected via a load-distribution hitch) was slightly lower in the rear. I simply opted to add air bags to even up everything. Running 25 lbs in the bags is all that is needed.

As ric3xrt noted, the brakes on these truck are incredible and of course having good trailer brakes is a must.

The other things that help out a great deal are, the 8-speed transmission and the Tow / Haul setting that holds the transmission in gears longer before shifting. Certainly, rear end ratio and tire size are other factors.

- EM