Priority of 10 is the highest number (lowest priority) you can have for a sold order. I think that trucks built for dealer stock have priority #'s above 10 but below 20.
This is going off of memory.
The main thing is allocation. Does the dealer have it? You can enter an order in the system and it will accept it als long as you did not chose an un-buildable combination.
So if you chose a short wb, standard cab, 6.2l with a 36 gallon tank, the system will kick it back and you will not get a confirmation code.
If you chose something that is routine, such as a crew cab 4x4 xlt (very common) and enter it in the system, you can get a confirmation code EVEN WITHOUT an allocation.
All it means is that when an allocation comes for that dealer, all of his orders WITH confirmation codes will be built. STARTING WITH THE LOWEST PRIORITY NUMBER IN HIS ORDER HISTORY.
So if someone walks into the dealer and says that he will pay $5k above sticker to get his truck sooner, he will get one of the priorities higher (lower number) than you and the dealer gets the $$.