I used to have Ram 2500 Laramie Diesel 4x4 as a work truck. I towed up to 13K-14K lbs. Pretty much the limit of the truck. Great vehicle. The heavy loads gave mpg of 7-8 and lighter loads, say 5K, right around 15 mpg. Unloaded, on flat ground (around Houston) and at 67-68 mph, I could get 27 mpg (2015 vehicle...seems like the last one I had, 2017, did not do quite as well). For the weight of the LEII, the Ram 2500 will have no issue and have more comfort and a better ride than my 2015 Silverado 4x4.
Any truck you get, the brake controller is a must.