http://www.mvpa.org/
Military Vehicle Preservation Association
They have been around since 1976 - has a list of clubs and groups that collect old military vehicles - great source of info for where vehicles might have been in civilian hands during the timeline for the game
and you got to love their classifieds - here is a taste
FOUR WEASELS
Two restorable, 2 for parts. Pictures available upon request; $6,000 for whole lot.
WEASELS
For Sale – call me!
1953 BRITISH FERRET
Scout car with clean Arizona title. Extras include: windshield, wipers, manuals, nonfunctioning Bren gun, helmet and tools with approximately 800 miles; $15,000.