You are correct in saying that there is not much pictorial evidence of the trailers especially the twin Axle 'CMP' type. I do have a reasonable amount on the single Axle semi due to my research into the early years of the North/South Military Highway.
Here is another twin Axle photo from the AWM
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Cheers
Cliff Hutchings
aka MrRoo S.I.R.
"and on the 8th day he made trucks so that man, made on the 7th day, had shelter when woman threw him out for the night"
MrRoo says "TRUCKS ROOLE" 
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