Dodge trucks 1940-41

[Oliver Missing]

I may be wrong about the Dodge nomenclatura, but afaik :
- the first letter means the production year : "T" for 1939, "V" or 1940, "W" for 1941 and later.
- the second letter : ??
- the first number could be "half-ton", as "3" for 1.5-ton
- the second number : ??
So, "VK-62" would be : a 1940 3-ton truck, "WF-32" a 1941 (and later) 1.5-ton truck.
Bart Vanderveen mentions a "VH-48" which would be a 1940 2-ton truck, but he describes it as a "3-ton" ?!
David, could you help ??
Regards, Oliver (»www.o5m6.de«)