Don't forget that 225.31 requires a disconnect at the detached garage. 225.33 permits up to 6 breakers to serve as the required disconnect. 225.39(D) requires that the feeder disconnecting means have a rating of not less than 60 amps for this application. Note that the section does not actually require a 60 amps feeder, but only a 60 amp disconnecting means. I think that the intent was to require a 60 amp feeder circuit, but the code words don't actually say that.
Don
