I can't find current numbers, but Chrysler closed about 800 (25%) of their dealers in 2009 as the auto industry melted down. That would leave somewhere around 2400 dealers in the US as a rough guess. Note not all of these will sell Rams, but we will stick with that as a guess - so it is probably on the high side.
I am also not positive of Warren Truck's exact numbers, but I know that Wayne Assembly does 600 F-150s per shift and I would estimate Warren truck is roughly similar.
That means that Chrysler could build one Ram for each dealer in less than two days.
The other thing is, Chrysler wants their cash and so does your dealer. No manufacturer wants to pay to have your truck sit on their lot longer and pay the carrying costs.
Most likely your truck is coded wrong in the system you see or waiting for some off-line option/rework/repair. Could be as simple as they ran out of the right color sun visor so they will install it offline when parts are available.