I saw an NAC Scania (Destoless) at TPY INT yesterday... the
suspension was tilted so badly. 
Destoless buses at Toa Payoh means they have been taken out of
service halfway (possible reasons, equipment change etc). if you
see that the bus has lost suspension means that the bus has been
parked there for a long time. Some buses lose suspension in 20 mins
(esp when people board the bus), like one Mk2 I saw. This does not
apply to buses with leaf spring suspension (means by right, a
Nissan U31RCN shouldn't tilt to one side whether
its stationary or moving).