< This is kind of absurd, I have been on busses all over the country, a metro bus, is a metro bus. There are not really differences based on topography or climate.
Off the top of my head, road salt, used in the northern areas of America to melt snow can cause corrosion of metal pieces on the underside of the bus. So Chicago or Boston might need to take that into account but Miami probably doesn't.
Yearly fluid film or woolwax treatment solves the rust concern in salt states. Roughly $1k/year/bus in operating expense. Schools do this to their buses already, it’s totally common.
Off the top of my head, road salt, used in the northern areas of America to melt snow can cause corrosion of metal pieces on the underside of the bus. So Chicago or Boston might need to take that into account but Miami probably doesn't.