What happens when you try to command them to enter the vehicle? Do they do nothing, does the game crash, etc..? The door actions are pretty simple, they operate on an X, Y or Z axis that determines which way they rotate or slide. Doors set as "person" are for personnel to enter/exit, doors set to "special" are for things like prisoner transport, doors set to "equipment" open for equipment acquisition, and "none" is self explanatory.... but, this should not affect your issue. Even models without doors can still "hold" or "load/unload" personnel.