I run everything I make in Wings through UV-Mapper and split the vertices at 43 :

You just have to make sure that truly round objects like wheels have a higher poly count, as otherwise the can look blocky.
(Happened with the wheels of the Lego engine.)

But if the polycount is high enough, round objects still will render perfectly smooth, like the cowl and wheels on this plane:

The nice thing is that by splitting vertices you dont have to add extra edges or select hard edges, and you dont have to worry about n-gons, either.

stahlratte