How many of us are there? Owners of Dodge based RV's?

I have finally purchased 7 new 16in coined rims and getting rid of those old 16.5 coined rims, however what tire size would you recommend, LT225/75/16E or the narrow and just a lttle taller LT215/85/16E.
23ft 79 dodge class C 440mtr, how was the lower rpm,s did you still have good hp in the mountains.

And my tire of choice is the bf goodrich commercial t/a all season, any problems with these tires are they quiet and smooth as many say.:C