I've never seen a school bus with air ride. Do they make them? I always wondered about that.
As much as I cry about my 2013 IC, I must admit that it rides better than any bus that I have ever driven. We have these old Freightshakers, I had some girls scream once when I went over a bump leaving the high school. The town that I drive for voted down fixing the roads, and voted to build the kids a new track. I smile every time I go over a bump-because I'm happy that the school now has a track.
High School Friend-"Hey! How are you! Well, I guess you can't be doing too well, you're driving a school bus."
All our buses here have had air-ride since the early 2000's. I think the boys just measure the distance from the tires to the wheel wells for the correct ride height around here. Just use another bus of the same model.