Long post, hell, i've writen longer hello's at thye beginning of a post
The illustrated van looks like a '69 from here & there was a change in the tail lights for the '69 model year.
According to my original 1967 Datsun 1000 workshop manual, the van sat a little higher than the two door sedan did. [the only other body type in '67] It was 5mm higher in the front, but there is no common point in the rear to compare. None the less, it only takes a look to pick the increased ride height in the rear to compensate for the greater load that these commercial vehicles were rated to carry.
Originally the vans used skinnier tyres too. They were 500x12x4ply on the front, & 6ply for rears. Sedans got the fat 5.50x12's