RTA (NSW) 4WD and AWD body-shape anomally.

Registration time again. Did the usual ring-around for the best deal of the CTP. I do the online quote but the computer message says to speak with a 'consultant'. I get told my 1994 Toyota Landcruiser GXL station-wagon is on record with the RTA as a PVS (panel van with windows and seat/s). I check the rego papers and the lass is right, it's a PVS. The RTA 'Vehicle Descriptor' explains what each shape is. I ring the RTA and am told it should be a PVF (panel van with windows and seats 4WD). To have the RTA alter the records I have to have the vehicle inspected at a Blue Slip station ($23.20) and go to the RTA where they'll make the changes. Mind you, I didn't stuff up in the first place but I have to pay for the changes. Good system, huh?
You're wondering why I went to this trouble? About $60 cheaper for a station-wagon or PVF, than the PVS.
Might be time for everybody here in NSW to check their rego papers to make sure their 4WD (or AWD) is a PVF and save about $60 on your CTP premiums.
I'm trying to find out what the RTA uses as a reference to describe a vehicle shape. Why a wagon-type 4WD or AWD vehicle in NSW is deemed to be a 'panelvan with windows and seats 4WD'?
Mind you, Toyota Australia 'customer service' tells me my Landcruiser was built as a 'wagon-type' vehicle. Big difference between wagon and panel-van.
Why is a Subaru Liberty wagon recorded by the RTA as a 'wagon' but the Subaru Outback (very similar in body shape) is recorded as a PVF (panelvan with windows and seats 4WD)?
Finally, a 2000 Toyota Landcruiser 'troop carrier' (panel van) modified as a Britz campervan, is recorded as a station wagon. Any ideas or is the RTA in a world of its own?