Given the penchant the game designers had putting odd equipment in odd places, I think the Littlefield collection fits nicely. They have British and German units stay in Canada. They have an Alaskan Invasion by the Soviets. They have a US division get "lost" by 800 kilometers.
When I played I tried to give the 49th some color by adding 24 DUKW transports which were "requisitioned" when one of their brigades was near the Wisconsin Dells (where they are used for
recreational touring).
Personally I would give Littlefield a little more eccentric personality (and more money and power). Maybe add a little John DuPont and Howard Hughes. Make the collection an obsession that leads to grey and black market deals.
Once you enter that world you find corrupt quartermasters, Insurgents who capture a single vehicle (and have no support for it), a dictator's cousin looking for a little cash, plus anything that would be above board.
You have to make Littlefield crazy to have the collection armed before TDM, but if you throw in a little of DuPont's or Hughes paranoia it might work. Personally I would not have the collection armed until "Wojo" type plants spring up.