As mentioned before, seems like folks are all over the map with respect to order fulfillment, no rhyme of reason...........
I'll share with you what I know albeit it may not be accurate with how it is done at RAM. You may find it interesting.
Before I retired in June of 2017, I was lead in vehicle launch programs. At the time, I worked for a supplier, we owned most (excluding driveline) of the wiring and ECMs in the vehicle so, when the vehicle came down the line and it didn't start, guess who got blamed. That is beside the point but a little background. This was for Ford at the Louisville assembly plant where Escapes were assembled.
As I stood around waiting for a series of the launch vehicles to come down the assembly line I took notice that vehicles came in batches of colors. For example, I would see several white vehicles followed by another color. That makes sense, they likely paint several vehicles the same color before changing over the spray guns.
I started to look at the WS and noticed that the vehicles were grouped not only by color but also by destination. The destination would include the dealer, adjacent dealers, city, and large destination areas (likely for rail shipments). Out of curiosity, I asked one of the plant engineers I worked with how the order entry works. This is what they told me.
First, you need to know for this plant that UPS (the brown truck guys) handled the complete logistics of the vehicle ordering process and vehicle transport to the selling dealer. UPS logistics organized the order of vehicles that went into the system. UPS also coordinated with suppliers the order that dashboards and seating (both JIT and externally built) would have to be sequenced so that the correct seating and dash would be on the line at the correct time. Driveline items, rims, tires, wiring harnesses, and many other components were sequenced into the assembly process by the plant.
Outside in the lot, finished vehicles came out of the plant and off to either a staging area for a car rack or directly onto rail cars. There was little to no on-lot inventory. Every vehicle assembled was a sold vehicle, either a customer's order or a dealer's yard stock order. Once the WS was issued, the vehicle was billed to the ordering dealer.
That is how it worked for the Ford plant in 2017. I don't know how much different RAM does it but a little inside of how it is done. Now, let your imagination have at it.