The second photo you posted is of another type. The trailer in your first photo is a 10 ton bow fronted trailer and was often towed behind Ford, Dodge and International 3 ton 158inWB tractor units many of them the roaster topped Aussie built models. The fifth wheel was a semi permanent fixing rather then the quick release items of today.
I have a lot of photos showing them in action often on the North South Military Highway (now the Stuart Highway) Between Alice Springs and Darwin before the NR Macks became availiable later in the war. The trailers then had a 'dolly' made to fit under the front and were used as a 4 wheel trailer behind the Macks. Problems arrose when the combined weight started destroying the roads which were not built for the weight loadings.
Pictured is a 1/35 scale model I made of a Ford rag top version.
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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"
