Dennis. I believe the 'S' meant the truck had a 'suppressed' electrical system. Meaning it was all shielded to minimize electrical interference with radio communications, and to some extent, reduce the possibility the same electrical emissions could be used by the enemy to direction find on the location of the truck.
Have no clue how the RCAF Vehicle Numbering System worked.
The 'VC' is very likely the RCAF abbreviated ID for the Station where the truck was based. Here in Winnipeg, RCAF Station Winnipeg's ID Code was originally 'WG'. At some point, this had the letter 'Y' added to the from to become 'YWG'. I have seen both the two letter and three letter ID's for Winnipeg on surviving wartime vehicles but do not know when the change took place.
Hope this helps.
David
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