Probably an amphibian plane was being used. Below are some photos of what the truck could have been. I tried to enhance the photo but with no luck but like Max think it was a Chevrolet but with standard civilian wheels rather then combat rims.
Photos are from the AWM and NT Libarary Service via the net.
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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"
