No idea, if you look at the spreadsheet it's kind of all over the place. There must be something else factoring in that we don't know about. For all we know they are still going to fill slots between end of July and the month of August
I am just guessing at the following, so take it as "I might be right":
I think the priority code is only an indication of where you are on the list for your dealer. For example, your order a truck on Monday (Priority 19, it is delivered on Wednesday and something is wrong). I come in that same day and order a truck at Priority 19, but they need to get your order built faster, then they assign a lower priority code (say 10) and yours will be higher priority than mine that is ordered at same time.
I found this as well:
The highest priority that a Dealer can use for a retail order is 10. An order with a “10” priority code will schedule ahead of an order with an “11” priority code, etc. This allows Dealers to prioritize the order in which vehicles are scheduled, especially when a Dealer may have multiple retail orders in the USOB (Unscheduled Order Bank). With the WBDO ordering system, retail orders default to priority code “19” so it’s important that a Dealer change the priority code to a lower number if they want the order to be considered for scheduling earlier compared to other orders.
So mine is Priority 1, but you may have a 19 and be built before mine as it pertains to the dealer.
Again I could be wrong, but from what I gather, this is what I take from it.
