The only Superior bus that comes to mind is something like this one:
Converted school bus, is that what you are looking at?
Some problems others have come across with school bus conversions are (but not limited to) obtaining insurance, not allowed in many RV parks (too Hippy-looking) need to paint over the yellow exterior to be legal. You can purchase a great highway bus (MCI for one) or a city bus (GMC's are really slick) and then have something to be proud of. (My opionion, of course)
You might want to visit the
web site and discuss bus conversions one the forum with the folks that have them - have converted them, etc. That is where I obtained my info over the years.
MC8 (1976) bus conversion.