Random-Task has begun converting the Onslaught maps from Unreal Tournament 2004 to vCTF (Vehicle Capture the Flag). The gametype is written in to Unreal Tournament 2004, but the game did not ship with any of them. First up is VCTF-ArcticStronghold. Keep watching for more to come.
To install a map, download and unzip to your Unreal Tournament 2004 directory. The .ut2 file will go in the maps directory, and the .u file will go in the system directory.