Please note this ticket is not done yet and will be refined soon.
The idea of this scripting command is to work similar to the attachTo scripting command but with one key difference. It gets the movement (speed, direction, altitude, etc...) and then applied that to the vehicle or AI as long as they are touching the object or vehicle they are attached to. If they walk off of the object/vehicle, they are no longer attached to it anymore but will inherit the objects movement (If a ship is traveling forward and I jump off the side, I will also move slightly toward the direction the ship is moving).
No matter how fast the vehicle/object goes or what the angle of the vehicle/object is, the unit will walk/drive normally as if they are walking/driving on the ground.