Robert:
I checked the GVW of the 15cwt vans where they were simply modified cargo boxes to see if the gross weight on those was lighter. They are in fact identical. A few collectors in the early days installed the house type bodies on cab and chassis that were actually built for the earlier cargo box with tarp and fitments.
Here is some more on the development of the 15cwt and 30cwt boxes as the two are closely related. You'll have to excuse the photographs as opposed to scanning the pages. These books are fairly rare and I do not wish to break their spines.
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