I was just watching the Window fit as it uses resources. It seems to vary from vehicle to vehicle. One time it needs 3 windows, then it needs 5. Watching the Door Fit, I see that Sometimes an SUV is a 2 Door, and sometimes a 4 Door. Watching further, when its a 2 door, it uses 3 windows in the next slot. Predictive ordering is on. I will watch the door fit to see when it decides what to pre order. But so far, here are some screen shots .
SUV 2 Door
SUV 2 Door, that needs 3 windows
4 door SUV calling for 5 windows
This is one Line that is producing all three vehicle types, one of each in sequence, I have attached the save game as well. Stop Touching Me.xml (2.61 MB)