Trucks and guns ID required please

[cliff]

Hi Guys. I found these pre war pics while browsing through Pictures Australia. http://www.pictureaustralia.org/index.html
this is a site that links to all Government Photo data sites in Australia. These pics are from the Victorian libary I think.

I would like to ID the trucks and the guns if possible. Pictures are circa 1937/38 and are of the Royal Australian Artillery 1st Field Cadre.

Pic 3: I believe this is a Thornycroft can some one confirm please?