I [finally] posted this new actor to my server for download. It is the same code I added to the CarBall mod, but designed for use with Onslaught.

The actor is used to teleport players (and their vehicles) to another location on the map. You can only teleport between VehicleTeleporter actors (you cannot, for example, teleport between a VehicleTeleporter and a Teleporter actor). You can, however, have the teleportation be "one way". To make a VehicleTeleporter connect to another VehicleTeleporter on the same level, simply enter the Tag of the destination VehicleTeleporter into the URL property.

Download from http://www.cyberrock.net/UT2003.html