1. Create vehicle with cargo positions.
2. Create group and add vehicle to group.
3. Fill the vehicle with crew from createUnit using vehicle group.
4. Give waypoint to move a position to combat area. (May not be needed)
5. Have nearby enemy units or weapon firing that cause vehicle commander to order units in cargo to unload in combat.
It may take multiple tries, but eventually one of the units that unloaded will form their own rogue group and not regroup with it's original group.