No.Your reservation is your place in line at a dealership, not nationally.
Think of it this way. A guy is standing in front of a bunch of buckets. Each bucket has a table next to it with a stack of playing cards, and each bucket has a number on it. The bucket represents an individual dealership, and the stack of playing cards represents the orders from that dealership. The number on the bucket represents the number of allocations that dealership gets and
the cards are sorted by reservation timestamp., oldest on top.
Now, that covers allocation and reservation timestamp. But what about shortages?
When the guy takes a card and puts it in a bucket, he is scheduling it to be built. Before he starts, he is told that Ford can't build any Hearts. (Commodity shortage) So, the guy goes down the line of buckets and picks up the top card. If it is a heart, he puts it down on the table and picks up the next card. If that card is buildable, it goes into the bucket.
He goes down the line of buckets, dropping one card in at a time, filtering out the unbuildable cards by starting a second stack, like you do in solitaire.
Eventually, some buckets have reached their allocation, so he starts skipping those buckets, regardless of how many cards are still on the corresponding table. If he gets to a table that is out of buildable cards, but the bucket still has room, he drops in Jokers instead, which represent "Dealer stock".
Why? Ford has to meet the allocation. Your reservation timestamp only determines your order of consideration during the process of selection, and is specific only to your dealership. If Ford can't build your Bronco, they won't. If Dealership A has 100 orders and 150 allocation, they are going to get 150 Broncos. If Dealership B has 400 orders and 200 allocation, they are going to get 200 Broncos. They are going to get those Broncos in order of availability of parts and then in order of timestamp.
Allocation then Availability then Timestamp. Customer comes last.
Except Ford doesn't see it this way because each Bronco will sell, and they will fill every custom order that came from a reservation. To the shareholders and upper-management, they are doing a fine job. As far as Ford is concerned, we are just a bunch of crying toddlers who don't understand "how the world works" or "Didn't understand what a reservation was."
They do not go down the timestamps in sequential order by moving to different dealers.
Using your bucket example;
1st bucket had 30 allocations this month, they go down the deck of cards until they have run out of allocations or materials. If they run out of reservation orders they can build, let's say after 25 customer orders, the dealer can order five dealer stock orders. then they go to the next dealer/bucket and repeat. Big allocation dealers will soon go through all their reservation orders and get tremendous numbers of dealer stock built before many other reservationists are satisfied. This is the outcome that Ford intentionally chose to replace the timestamp promise. There will be big dealers with lots full of dealer stock before early reservations are filled at smaller dealers.