I had the walking Morris encyclopedia here today, he says only the first picture from Hanno with the Luftwaffe crew is a CS11/30, all the rest are the military WD10/40 trucks and even Vanderveen has got this wrong since these mil types are based on the CS10/80 (10ft WB and 80cwt) not the 11/30 (11ft WB and 30cwt) although they look like it.

Simply put its a C range truck, Six cyl engine, 10ft wheel base and 2 ton (40cwt) capacity. The mil WD10/40 "version" of the 11/30 has some noticeable differences:
Chassis size and width
Bull bar position
Headlights (on bull bar not wings)
Wheelbase (10ft)
Bonnet
Scuttle
Mudguards.

R.