You do understand they have…
You do understand they have a large number of pre-built trucks.
My brother in law works at the facility. They have rows in the lot that are done. Each row is built in a different configuration. You order one they take it from the appropriate row and ship it.
This will be more evident when a customer orders in Jan 25' and sees their truck was built Dec 24'. I do wonder how people can be so uninformed about how vehicles are manufactured.