[Tony Smith]

Lang, there is no official headings as such in the register, just columns ruled by the clerk who tried to organise the information on hand.

For the pages that Mike has shown (in the AIF series register, which also shows shipping information for vehicles sent overseas), the columns are arranged as this:

1st column: Ship that vehicle was loaded on (ie Largs Bay, etc)
2nd Column: Port of Loading (ie "M" means Melbourne)
3rd Column: Destination Command ("M/E" means Middle East Command)
4th column: Date of shipping (probably date of loading or handing over for shipping, as the Clerk would not be privvy to dates of shipping movements)
5th Column: Vehicle registration class ("V" = Van)
6th Column: Sequential registration number (Complete number shown on vehicle would be :AIF V225. Vehicle class in red)
7th column: Vehicle make (CVT = Chevrolet)
8th Column: Vehicle nomenclature. Not much space in this column, so it was often abbreviated or just shortened to one word. In this case "12cwt".
9th Column: Engine number.

Other column were also used to list other types of information when available or necessary to define vehicle types. Examples include date of Manufacture or Delivery, Chassis Numbers, Tyre sizes, specialist vehicle body types, etc.