GC, I can not confirm the dealer or Chevy's story, but maybe anything can be solved by the application of cubic dollars. I have no experience with this gadget, but these guys seem to think that they have the answer for you, in a box:
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Seems kinda pricey, but the dealer might be as bad or worse. At least this thing, you can take home, or put it on the next truck, if that is reasonable.