When full timing you likely will be staying in one place longer rather than traveling every two days, once the newness of your freedom wears off.
Thus, the living space and cargo carrying capacity would become more important than the traveling cost or comforts.
We would want a class A with slides if traveling full time because it would be our home.
When traveling in the Rockies and western states with an A, the big front windows provide some especially scenic views that make traveling worthwhile.
1995 CC Magna #5280
C8.3L 300hp Cummins, 31,000lbs