Try removing the Condition: Anyone Present that should work.
*cough*
Do not remove that condition... it's very necessary
The trigger must be set to present, otherwise the units in the trigger (the array called thislist) will come up empty.
If you want this trigger to be the end one in your mission, I suggest you set it's Type: end# and leave the onactivation field blank...
Make sure the radius of that trigger isn't set to 0,0, or too big either... the area of the trigger should cover the area you need to get the trucks to to finish the mission.
Also, make sure
both arrays contain the (correctly spelt
) names of all the trucks