[launchd-dev] Launching tunnel driver with launchd?

Hi, I have a daemon that depends on a tunnel driver to be loaded, for it to be able to function. Both are currently using StartupItems, so I would like to migrate them to use launchd. The daemon is aiccu, a 6to4 tunnel, and the driver is tun/tap. What I would like to know is what is the right way to loading the tun/ tap driver with launchd, if launchd is the right mechanism for this? For the aiccu side, it would appear that the SampleD example: http://developer.apple.com/samplecode/SampleD/index.html would be my point of reference. Any help would be appreciated. Andre