The extra capacity of the 3500 is wonderful, and I am not sure that it rides much worse than the 2500.
If you are interested in the Express, I recommend the just off rental 2017 White Expresses that are currently available. Most have less than 25k miles, and the price is in the low 20k. All you need to do is add a hitch and brake controller.
I put the XD hitch on mine, and can just bumper tow my trailer when needed, without the weight distribution bars. The price of this tow vehicle leaves funds to purchase a travel trailer.