Those are just charming. I don't know which one I like the best. Thanks so much for showing them.
I have no more real antiques, but how about this Renwall gasoline truck for consideration? Similar models came with an American Flyer auto unloading car in the 1956 catalog - maybe other years too. But doesn't it look a little large for 3/16, especially if we have accepted the F & F Fords as such? Note the size of the headlights: All (single) headlights were the same size sealed beams then. And don't the the doors look kind of big? And how about those gigantic tires?
I know it's only a toy and tank trucks are a big vehicle, so maybe that's how they got away with it.