Lots of confusing contradictory info on DRW. It's hard to make sense of all the info because what people actually do with their vehicle varies so widely.
The crazy rigs, built by those who could build a space shuttle if they desired, mostly seem to go with super singles. Unless you are building something colossal, it seems the best path for us mortals is to stick in the 350/3500 range with single wheels. The conversion to super singles is not cheap.
EDIT: If you have a dually, I don't think there is any imperative to 'fix' it at all, or it being a problem for almost everything people normally do.