I certianly like my 3/4 ton diesel and it's abilities over any SUV. And I have been out in the wind with my 5th wheel behind it.
It does not take a crew cab dually diesel to tow though.
For decades 1/2 tons with lower power engines, 3spd trannies have towed trailers. Did they, or do the newer models tow as nice as the 3/4, 1, and 1-1/4 ton diesels do? No...
But if you stay in the slow lane, take it easy, don't try to tow at 75mph, then most 1/2 tons will do ok(if you stay in their ratings). As others have noted, mileage will be poor, and power limited, down shifting ect. But if you do not need a 1 ton dually diesel, then why have one for occasional towing? It is certianly important to understand the vehicles limitations before buyin or towing.
Heaven forbid, when I was growin up we had a travel trailer only a little smaller that what the OP mentions. We towed with a '72 Plymouth Fury III, 4 door, 360ci 3spd auto. Had a aftermarket hitch, with weight distribution. It worked fine, and was comfortable for growing family. Mom drove it all the time, and I learned to drive in that car in the late 70's.
Between us and the earlier owner, that car /trailer traveled N Calif just fine, in many wether conditions. And, we went over Donner Summit in the slow lane. And included Calif's pitiful roads.
I prefer my heavy duty truck. But at the same time, towing within the limitations of a vehicle should be ok too. Knowing those limitations, and not driving 75mph in to the wind makes a big difference. Stay in the slow lane and driving reasonable.
That is an overly-simplistic view that is all too common. See the above posts about wind.