Help - what is she?

[JayMcCann]

Hi,
We have recently purchased this truck but we are struggling to work out exactly what it is?

We have been told it is a WW2 truck. The issue is we can't find any descriptions or images that match.

There is an observer hatch with two handles (we have read there is a difference between the two).

Apparently anything pre 1947 didn't have VIN number marked on them?

The two little plates (from what we can work out say)
Plate 1:
Holden
K 2887
MODEL CHEV.CAB
SERIES (blank)
JOB No. A ( we can't really read this line)

Plate 2:
COLOUR DLV (?)
LY STONE

Colour wise she looks like she was green, then red, then green. However, upon further inspection on the doors it looks like it might have been the stone colour...

Any help would be greatly appreciated