All of your details can be skewed by limitations on available parts. Wasn't the teal colour restricted and other orders went through for the exact same van? It was the new owners decision to unwittingly pick a super popular option that delayed delivery. If your spreadsheet can track orders with part restrictions.... you are taking on a pretty large task.
You will also run into the recent use of allocation based on average days on lot for that model. So if a dealership has slow moving stock in the model you like, they may have less orders being taken by the factory compared to a faster selling dealer, but for whatever reason, your shadow will never fall on the ground at that faster-sales dealership ever again.