>>428490It doesn't matter if people are living in them or not, a vehicle is a vehicle and endures X amount of wear & tear, requiring Y amount of maintenance after Z amount of miles.
And school buses are subjected to a particularly excessive amount of wear & tear, due to the constant stopping-and-starting type of exclusively urban driving their doing.
The school bus drivers hereabouts flog the shit out of their (full size) buses, as they're on a tight schedule and carry a ton of kids.