Believe these are all Cadillac Service Cars - can see the S prefix letter on the number plates in a couple of the photos.
S.842 Masterton Pahiatua Palmerston North service
S.131 Newman Brothers Car
Side view showing the rows of seats and the side doors ..
Note the circle and Flash on the the rear wheel " Spat " is the same .. was that Cadillac or Newmans ??.
The wheels are all Truck style, but they have the sidemount Spares ..