I am being told the same thing, either order an SLT or an Ultimate. October will mark 24 months since I started this process, so far GM lost my business annual truck order, and lost all our salesmans vehicle orders to the competition 2 years in a row. My sales guy isn't happy he lost almost all my business, but as they say, if you can't deliver what I need, I will go where they will. GM really needs to take care of their long term customers.
I am also now speaking with a different dealer, see if they can get it in a few months or I am done.