Ford dictates, "what truck, in what config, it can build"
Depending on the Dealer's sales rate.
I just gave up an allotment for an F150 crew cab, because it had to be built with a 3.7L V6. I have been selling/ordering Fords for 8 years, and have yet to sell an 2wd Crew Cab, V6.
The hold ups for a buildable order are, Tuxedo Black, Red Candy, LT 18" and 20" tires, Chrome 18" and 20" rims, 3.5L Eco Boost, and 5.0L engines. And many more.
Your Dealer could configure your truck to a buildable order, if you sat down with them.
I am recieving trucks 4 1/2 weeks after ordering them, but I have to build the truck the way the plant can build them.
The Japan earth quake, has caused many bottlenecks, for Ford, but a truck can still be built quickly, if you order it right.