It definetly has everything to do with what your doing with your conversion.
As a general rule of thumb, if you are going to be 40'(overall) or shorter and hauling a smaller (26' or less) tag trailer a single will be fine.
A single will have a little better ride, over a dual axle due to the added weight on the 23,000 lb. axle, but a dual will handle better as you get closer to that max.
Bill
Bill
2003 28' Show Hauler Motorhome on a 1995 FLD 120
www.showhauler.com