That's wendle's pilot house on later Holden chassis in the back ground. I think these KEW trucks are similar age to the pilot house trucks which in Australia ran through to the early 1960s.
as far as I know they are an English Dodge (may have come as a fargo as well) built in an English factory at a place called Kew (hence the name) also the source of the 250.6 cu in sidevalve six used by Chrysler Australia durig the 50s which had KEW as the start of their engine number. I believe...
There what we call utes over here (shortened form of utility) way more popular than your pick up style vehicles. Quickly being over taken by japanese ( sorry asian, they come from all over now) light trucks.
My understanding is that crossflow radiators have an advantage because they have longer tubes so allowing the coolant greater longer contact and more cooling particularly as 'modern' cars got grille areas that were shorter and shorter so reducing the height possible for the tubes in a vertical...