I found this extract from the WD Mechanization Board draft report of 1939-40that was never published:
Quote:
To improve the vehicle in its role of wireless truck, a standard Morris-Commercial type C.S.8.T. 15-cwt truck was fitted with modified rear springs to the company’s drawing no. C.9699, and trials were carried out in direct comparison with a similarly-loaded standard truck. Personal observations and vibrometer records showed that the vehicle ran much more smoothly on roads with the new springs.
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Is there any evidence that post-1939 orders required these modified rear springs please?