Planning a 440+6 tow vehicle, need a plan

As far as the gas mileage goes my desire to drive vintage overrides. I am stubborn like that. I only own vintage mopars. Only 440s and hemis. They are just what I have grown to like. No modern daily drivers in my stable.
I don't have a 3/4 ton truck at present. I had a 69 dodge power wagon but the frame was really not all that strong as one would think. It was not boxed like this 56. The 56 frame is much stronger than all the power wagons I have had over the years..
I know the benefit of floater axles you get with a 3/4 ton truck.
I am getting older and don't have the best back these days. I have let go of all my power wagons go to new homes due to very rough ride when using them on pavement.
On dirt they were great that's where they shine.
A two wheel 3/4 ton would be great for towing.
Not sure how they ride. Never had one. Probably nowhere near as comfy as the Desoto.