They show as in stock at Summit. Which size/part # are you looking at? It looks like they only have the 17x9 with -12 offset that might work, part # 2379412.
I would say that a 17x9 with 0 offset is preferred. I have some 17x9 with -6 offset and it's not a problem and the 17x9 with -12 offset is only 1/4" more of poke compared to mine.
Here's my truck with the 17x9 -6 offset with 35x12.5x17 tires on a Sas truck.