I have a 2017 Ram 1500 Crew Cab with the 5.7, 3:21 gears and a manual transmission. I tow a 38 ft. Trail Runner TT that weighs approx. 7K loaded. Now attached to the frame of my TT, I have a 2 in receiver that I use to tow my 1200 lb. Harley Tri Glide with the front wheel up and a Predator 3500 watt inverter generator hanging on the rear bumper. Overall length, TT and trike, is approx. 45 ft. and roughly 8200 lbs. Ram, TT and Trike runs out at approx. 60 ft. I use a Reese 66559 Steadi-Flex Trunnion Weight-Distributing Hitch Kit with built in sway control and run the highways at a reasonably constant 70 mph with the cruise control on. I HAD a SLIGHT sway issue when I first added the trike, so I made an adjustment to my WD platform to throw a little more weight on the steer axle. Since doing that, I've NEVER had a consistent, or persistent, sway issue, got a documented average 8 mpg over a 6k mile trip from western GA, to southern Utah and northern AZ, then a beeline for the Outer Banks of NC then home to Columbus, GA. Trans and Oil temps ran only slightly higher than normal, so no issues there. Yes, I keep trans and oil temps displayed on my screen. I also installed an exhaust temp gauge, JIC!
I WAS waiting for the 2019 2500s to be released before that recent extended 6k mile camping trip. However, since FIAT/Chrysler now seems to have developed a SEVERE aversion to manual transmissions, for either diesel or gas engines, I will keep my 2017 until the wheels fall off. Either that, or my next tow vehicle will be an S model International Crew Cab with a 300 Cummins and a 9 spd. Eaton. from the factory that I will have converted to a 13 spd.