Yep I don't understand the Trabant thing but it's some kind of obsession. Get this:
Northolt Wing is at the USAF Museum, the largest military aircraft museum in existence. We can look at almost every plane flown by the USAF and their opponents since WWI. But noooooooooo, our Polish and Russian pilots want to stop and take pictures by the Trabant that is in the museum lobby!
I think the shotgun is for multiplayer.
M163 is fun as hell though. I made a mission with some INF squads and trucks and Scuds going down a road, then put myself on a nearby hill with Mr. Thundermaker.