Lets start again.....
(1) You need to be on or near the line at the gate, it varies at each airport
(2) The exit statement needs the correct measurements for the cargo doors, I only gave you an example not the proper one for each aircraft.
(3) The cargo doors need to be open, if more than one you need to open them all
(4) The Parking Brake has to be >>> ON <<<
(5) FSX Settings: Advanced animations ticked
(6) FSX Settings, Traffic Tab: Airport Vehicle Density: Medium or above
These are just about all the things that might affect it working or not.
Reider
Well my Airport Vehicle Density was at high so i switched it to ultra high and it worked.
Thanks for all your help Reider, youve really helped me with this game. Im oviosly a big noob coming from flight sim 2002 
