David,
I was under the impression that the large bonnet was brought about by the War Department specifying a Concertina air filter. It was rounded off on production vehicles. Later ( I would suspect circa 1942 ) a new oil-bath air cleaner was introduced, without the necessity of any external modifications.
A change of policy with regards to open cabs, windscreens, and canvas cab doors/curtains changed the face of many of the trucks that had been in production from the early war period.
__________________
George Cross Island
|