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Update for everyone who offered suggestions . . . and so someone else may learn from my ordeal . . .
My GMC dealer checked the suspension and the other possible causes; all fine. Did their own road force test and both the rear tires (the last two from the set I purchased in January) are out of spec; the dealership's tolerance is 19. One came in at 20, but the other one registered a 39--double the tolerance! Of course I prompty called Discount tire with this information; they said they will need to do their own rechecking of the two rear tires but are prepared to do a new set, different manufacturer (and I'm ensuring they are a better/more expensive tire after all this annoyance!!)
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Onward, through the fog . . .
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