Discounting improper tire balancing, what would cause a Bus to vibrate and
shimmy at highway speeds?  Suspecting tire balance, I dropped the van of at
the place that mounted my new Agilis 61's and they rebalanced them, making
a point of telling me that they were okay when they put them on the
machine.  I notice at highway speeds - over 50mph - a vibration through the
body of the bus yet the steering wheel remains somewhat placid.  No pulling
to the left or right.

Any clues...?

Alan Bosch
& Phred ('88 Wolfsburg)