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I just found the official GM production figures for 1941 and 1942.

Vehicles built for commercial sale had different model codes.

Taking the civilian style Suburbans and Panel Delivery vans produced for the US Government of 1/2 and 3/4 ton 4x2 size:

1941

Model Code and number built.
20A 1/2 ton Suburban 600
20D 3/4 ton Panel 4
No 1/2 ton Panel purchased by government.
Total government purchases for 1941 including pick-ups, telephone etc 1,399

1942

Model Code and number built
21K 1/2 ton Suburban 676
21B 1/2 ton Panel 55
21F 3/4 ton Panel 44
Total government purchases for 1942 including pick-ups, telephone etc 1,641

Some conclusions:
My vehicle from the data plate - 20D - is one of only four government order 3/4 ton panel trucks produced in 1941.

There is now no mystery why there are so many Suburban photos with so many produced.

These figures include about 50 RHD Pick-ups and 50 RHD Suburbans - who were the customers?

Lang