When I was looking at doing air suspension this is a document I found:
http://www.transport.qld.gov.au/res...icle_Replacement_Suspension_Modifications.pdf
The way I read this the only way you could have air suspension in QLD is if you could not change the ride height.....there goes half the fun. Unless you can prove it is needed to load disabled passengers and then you may get special clearance.
I would say this is the same for having coilovers adjustable from in the vehicle.
Maybe the cars that do have this functionality get around it by comeing that way from factory.
Mind you the QLD Transport Modification booklet says the following about suspension. The last paragraph seems to imply you can so air bags in certain setups.
Lowering or raising of vehicles
The road clearance of a fully laden vehicle must not be
less than 100mm measured at any part of the vehicle
other than the wheel rim or brake backing plates.
(This does not apply where a lesser clearance has been
specified by the manufacturer.)
When lowering or raising a vehicle body (front or rear),
the following additional restrictions are based on the
manufacturer's dimensions for the standard unmodified
vehicle while unladen:
•
The ride height measured between the rubber bump
stop and the corresponding metal stop may be reduced
by no more than one third.
•
The rebound travel measured between the rubber
rebound stop and the corresponding metal stop
(or the extension of the shock absorber for vehicles
without a rebound stop) may be reduced by no
more than one third.
6 7
•
Coil springs are to remain in locating seats on full
suspension droop without forcibly being removed.
In addition, the normal relationship between the front
and rear suspension heights must not be unduly affected.
Replacement springs (shorter or taller) must have the
same or greater load capacity as the original springs.
Suspension coil springs must not be shortened by cutting
or heating. Leaf spring suspensions must not be raised
by the use of extended shackles, adjustable metal plates
or by placing the leaf springs to the opposite side of the
axle. If lowering blocks are used, they must be either
steel or aluminium.
Airbag or air pressurised shock absorber helper springs
may be fitted in addition to the original suspension.
However, replacing some or all of the suspension system
with an air or hydraulic suspension requires specific
approval.