Another little noted and hard to see detail present on almost all US cargo trucks of the time:
(Aussie, not to worry as this does not apply to tanker trucks.)
Almost every US cargo vehicle had this tool tray (drawer) tucked between the rear frame rails. (I believe this is where the tire chains were carried.) And almost every scale model since the beginning of time shows this drawer/tray in the end beam but almost no model company has ever seen fit to model the actual drawer enclosure as seen from below.
Here it is on my CCKW:
And again on my Mack NO:
Somewhere along the line it occurred to me that I should model the actual tool tray underneath!
Seen here as scratch built on my Diamond T Wrecker:
And as much as I criticize the HobbyBoss CCKW series offerings for their mis-shapened cab and fenders, they are the first model company (to my knowledge) to actually include the tool tray underneath as seen below.
(FYI - Their CCKW series is a tour-de-force in every other way as regards detailing!)
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You might also note in that first reference photo (red circle) that all military towing pintles rotate to accommodate the lunette on the towed trailer when at extreme off-angles. So the REAL pintle is often seen as not perfectly straight up and down.
I almost always include this small detail in my builds.
(I have also always feared a competition judge would mark me down for this.)