Feeder services like 307, 811 and 945, as well as trunks
like 171, 172, 189 and 851 have plentiful OC500LE fleets. I would
recommend service 171 or 172 if you want to joy ride on
them, they passes by those ulu areas which can be a
sightseeing as well 
.
If you want can also try luck on other services like 67,
167 and 854 which have a few OC500LE fleets too.
regular cameos includes 75, 700 & 970 also
