Because the bus itself is unbalanced.
The vast majority of it is empty, padded space, but up front is a large engine, fuel tanks, and so on, so the bulk of the vehicle’s weight is up front.
By moving the rear axle forward, it helps reduce the turning radius of the bus to allow it to service more areas with tight turns, and reduces the bending moment on the frame, extending the service life. As school busses are by far the safest method for children to get to school, if you can service by having more busses in service or able to reach more children you are literally saving lives.
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