Car seat in an extra cab?

Generally in Queensland any seating changes require engineering certification and a blue plate (modification plate).
(Technically that also applies to removal of a rear seat for additional load carrying space.)

From a recent thread along the same lines you cant put a baby capsule or booster seat in the front seat of anything.

From Qld Transport web site


"When can my child sit in the front passenger seat?
There is no set legal age in Queensland for when a child can sit in the front passenger seat. The Department of Transport and Main Roads recommends that children sit in the back seat — it is the safest place for a child. Once a child is old enough to use a booster seat, they are able to sit in the front seat (using the booster). When vehicles have passenger side airbags, parents/carers should check the car's owner's manual before putting a child in the front. If you have to put a child in the front passenger seat of a vehicle with a passenger side airbag, ensure the seat is pushed back as far as it will go.

It is legal to use a capsule or car seat in a ute or van, as long as there is sufficient space and an anchor point is installed."

http://www.transport.qld.gov.au/Home/Safety/Road/Motor_vehicle/Child_restraints/Rs_mv_restraints_frequently_asked_questions

Oh well cant win them all

Maybe the thread was about a different state but it did say that a guy wanted to carry his kid (under 12) in a front seat and the opinion was he couldnt in an airbag equipped vehicle.
Cant remember which forum it was on sorry.

We all know that all the states regs are exactly the same NOT.