I have two objects, Object A and Object B.
Object B contains two Components; "PressureTrigger" and "MovementTrigger". Both Components subclass the "Trigger" class.
Object A has a Component that is trying to reference a "Trigger" from Object B.
The problem is, I cannot specify which of the two "Trigger"s to reference. Unity 3's Object Selector does not allow me to specify which component I am attempting to reference.
Realize that you're essentially saying that this one gameObject is both a Trigger and a Trigger... which is like saying that my chair is a chair and a chair, and has all the functionality of both.
You probably would do better to have one of the triggers be parented to the other.
If you need the functionality of two Triggers on one Object, you might try adding
var trigger : Trigger;
var triggerType : String;
and then, in your Start function
function Start() {
trigger = trigger.GetComponent(triggerType);
}