alex try a simpler method. Use Advanced mission editor (click the 'easy' part of the editor screen- if you dont know ;D)
If you are driving give your self a waypoint to the place of pickup called 'load'.
Give the group of people a waypoint called 'get in' and then use the 'synchronise' command to drag a line between the two waypoints. (should be blue)
When you reach the destination your units should get in whatever you are driving.
All you need to do is repeat these steps but with a 'get out' waypoint for the units you picked up and synchronised with a 'transport unload' waypoint for yourself.
Please not that to see the waypoints it should be activated in the WP box selection or the editor should be on cadet mode. (ofp has a bug which sets it automatically to veteren difficulty, so open a single mission then escape back to the menu)
They should get out once you reach the destination. Give me an email or im on msn for gridlocktakedown@hotmail.com if you need further help.
I prefer Waypoints to scripts, but still use both
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if you want the units to join you for an assualt give yourself another waypoint called 'join and lead' and the other units a 'join' WP. Sync em together and they will follow you. (just swap it around if you want to follow them, but make sure they have their commands to carry on the mission)