A rack and pinion won't really even work for what I need. I like the swing set idea a lot better. I also have a limited amount of space to work with, and I can build the linkage basically any way I want, where as a rack I can't do much with.
What do you mean the cars in the drive have them?
Any pictures will help me out. I have a few from Camburg, but I've never really seen one in person and I want to see as much as I can to make sure I grasp it the right way.