if the truck is nothing but a temp. transport
then why not just let him be in a group of his own?!
Put a "LOAD" waypoint for the truck and synchronize it (F5, drag a line) with your own "GET IN" wp.
Then a "Trans. unload" and a "get out".
This way, all ya gotta do is to tel yer men 2 get in when the truck arrives,
then get in yerself (player commander has to be last man in), and the truck will move.
Same thing when ya get out; if you're not automatically KICKED out, just tell all yer men to get out & then get out afterwards.