Some words are just ruined.

For the Darwin's World adventure I am currently writing, which you can PLAY at GenCon this year, but I digress, I have these armored buses with escape hatches in the top.

The idea being you crashed into a wall, soldiers come out the top, and scramble over the wall. I decided to call them "trojans" as in "the trojan horse".

After listening to my players chortle every time I mentioned "ghouls scrambling out of the trojan" I think I'm going to go with "battle wagon".