there i a guy with the nick obi-wan or something like that. he has a pretty good write up on plumbing a OBA system.
Here is his site: http://www.jedi.com/obiwan/jeep/yorkair.html
Here is another site which has some links to other OBA stuff: http://homepage.mac.com/rifraf/york.html
All It Takes Is Money.
I'm the reason why you can only have Jeeps for Avatars. You're welcome.