Did you buy your ONE new or used? Have you check the suspension links or sway bar ends? Or asked what your dealer thinks? Take them for a test drive and show them.
Whan you say thumping you don't mean tire noise do you? As in feathered or cupped tires? Run your hand along the circumference of the tires to check they are not "hilly" or have bumps on them.
Good Luck
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