Ah so it looks like trucks 1 & 2 are 1940 WA Chevrolets with 133inch wheelbase and the 3rd is a 158.5 inch WB.
What looked like a headlight on the second truck is not as shown on the enlarged photo.
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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"