Tony.
One of the standard comments one finds about the CMP production during the war, when compared with other vehicles manufactured, is the very high degree of standardization of parts, not only between the various weight categories, but between the two manufacturers. They kept it as simple as possible and didn't change things unless they really had to do so.
On that basis, your evaluation of the common components between the 15 and 30cwt classes makes a lot of sense. For the 60-cwt, certain things had to be more robust and were implemented accordingly.
Regarding the 60-cwt you ran across that lacked the auxiliary springs, perhaps they were simply removed from that particular vehicle, for whatever reason, but like you noted, one vehicle is interesting, a bunch of them would make a statement.
Cheers,
David
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