I had a 1984 Chevy 4X4 2500 longbed & cab high campershell (cap). The truck was modified with an aftermarket 3 inch spring lift setup. The springs replaced the stock units and provided 3 inches of lift. The stock overload springs were retained but re-positioned to contact the new springs properly. The aftermarket springs were designed to lift while providing a soft ride compared to lift kits.
I used 16 inch rims with 33inch mud & snow tires tires - wide but don't remember the width.
My brother, a steel fabricator, took my stock equalizer hitch and added a new shank on top of the old to drop the hitch so my 23ft TT towed level.
This whole setup towed beautifully. Very sable and the ride was very comfortable.
