You are the best. I can't thank you enough. You can use unload waypoint on the truck so the player know where to go too.
In my case for future use:
Hemmit with human driver , 2 groups on cargo with predifined move waypoints.
set waypoint activation on the trigger you want for each group and set trigger owner to the truck.
On trigger's init field you put: grp leaveVehicle veh
*Where grp = name of your group
veh = name of your vehicle
The logic behind it is that the group is not able to use that vehicle any more so they are "forced" to disembark as soon as the vehicle stops.
I am searching for this 2 days now.
Thank you F2kSel for helping me out soooo much.