Armored Cars

Back in the 1930s lots of money traveled by railroad.

In mail cars. 

People used cash for most purchases and set lots of money by post office.

Criminals took to robbing trains so bad that the Federal government put armed troops on the trains.

After they killed a few robbers the robberies stopped.  I am thinking about similar wargames using armored cars instead of trains, or maybe in addition to them.  So I have been buying armored cars.