The only thing I would add to this discussion is wheel weight capacity. I mention this because GM uses aluminum wheels on the 2500 and steel wheels on the 3500 SRW. When I ordered ours, I was told I couldn't get the aluminum wheels because they weren't weight rated high enough to match the capacity of the 3500 SRW. I don't know if that was true or not, since I don't know what the two wheels are rated at.
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