When this topic came up before, and confirmed by Rickson, mixing tire sizes for use other than getting to town with a flat, is not recommended for trucks with 4X4. If you are running 4X2 this would not be an issue. But you have listed your 3500 as a 4X4. Hopefully someone will remember why this is an issue with 4X4 and can further explain.
My Rickson Wheels and Tires were delivered a month earlier than I had requested and perfect right off the pallet (I ordered 7 tires and wheels). With continued use for more than 2 1/2 years they have been trouble free and never in need of an alignment. I have Continental HSR 245 steer tires on the front axle and drive HSR tires on the rear and spare.
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