I'd bet that a lot of the problems that drivers have with them is not operating them correctly. They need to be engaged, run, and disengaged at a certain speed that matches their rotational rate.
UPDATE- August 2019, bus is still for sale after a few months of confusing life happenings, then we thought we had a solid buyer. The bus is now located in BUFFALO NY. Feel free to comment here, PM me, or call/text 607 793 4833