Hi Cliff:
Since you are so far along, I will wait for the disc.
Regarding your photo, as I recall from a book I saw long ago, the trailer is laying a treated plastic sheeting over sand/coral prior to either paving or pouring concrete for an airfield runway.
I believe it was needed as the sand/coral was so porous that the paving materiel either would not adhere properly or would end up with sinkholes or something like that. I would imagine the dual wheels on the GMC were for extra flotation so it would not create ruts due to the heavy weight of the plastic rolls and the adhesive materiels in the barrels.
I do not have a better photo of the trailer but I would think you can scratchbuild something fairly close with that explanation.
Edit: These were probably SeaBees and if anyone has a history book or site on these guys you may find a better photo.
Cheers
Bill
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