The problem I have with tl's like DoD or Tl-191 where things have difference name is only a few things are changed. With a PoD of 1812 or even 1860 language is going to evolve in very different way so that by 1950 or 2000 it is as different from our language as that of 1850 English. As different words come to prominence and commonly used words fade away.
Personally you should make changes much bigger that substituting Barrel for Tank, or you should stick with Standard English.
Personally you should make changes much bigger that substituting Barrel for Tank, or you should stick with Standard English.