The top one looks to me similar to armoured 4 x 2 trucks in the UK and elsewhere..this photo is of the Canadian 1935 Chevrolet and Ford 3-ton chassis bodied as armoured cars.
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I am guessing the top one as a 1940 4 x 2 Chevrolet, based on a chassis assembled by General Motors Java. The rear truck I think is a MS series 4 x 2 ...it's a 1941 Model but that front bumper is a US style and NOT Canadian MCP style. A guess again at GM Java-assembled chassis with windscreen under Defence Aid. The bottom, later truck could be a COE GM product. We know that GM Continental imported GMC COE trucks as chassis only, and GM Java would have imported similar trucks. Anyone recognise the wheels though?
Oh! Nearly forgot...the armoured chassis must have been at least 3-tonners military rating, or 1.5 tonnes civilian rating