Can you identify this truck?

[Glen]

This picture is of a truck at Abu Sultan near the Suez Canal in North Africa. My Grandfather on my Dad's side was with the Argyll and Sutherland Highlanders (British) and, according to his pay book, he was a "Driver I.C M.T." so I'm also assuming this is the vehicle he drove. I'm assuming further that I.C. M.T. might mean something like " Intensive Care Medical Truck or Team or something like that"

First of all: does anyone recognize the vehicle type?
Any suggestions as to what "Driver I.C. M.T." might mean?

Cheers,
Glen.