Lots of MD trucks for sale as the modern 350/3500 will pull MOST any new RV out there.
I tow more than most on here at 33K combined and 35K when double towing my Motorcycle trailer with two Cruizers.
I am under FAWR, at RAWR and under GCVWR. Truck "HANDLES" the load GREAT. Many say their truck "tows just fine" in my mind it's all about being able to handle the load. I have towed in 40+mph side winds thru the mountains at 75mph with no issues. That means lots of gusts.
14% down hill grades for miles in 2nd locked at 30mph with cool brakes at bottom of the grade. Or up that same grade locked in 2nd and cool trans at the top even in 90+ temps.
It's a towing beast right out of the box with no mods needed.