All of the new trucks I bought were from the inventory sitting on the dealer lot. That's why I liked how what I wanted were all in one package, and it was listed on the window sticker making things easier (seems I remember "options package 864A" maybe ???).
Now, if I were ordering a truck with specific options, I can see running into problems where some things weren't available in certain combinations. Likely, because it wasn't accommodated by the production planning process. I wouldn't be happy, either, in that case.