I have the same problem. Took my 2023 elevation to the dealership at 18000 miles. They said my tires had “chop” but I wanted it noted there was something wrong. I replaced the tires at around 34,000 miles and a the whole time the shudder/vibration remained, getting more aggressive as the miles added up. Never stopped. Then asked the local service garage to rebalance the tires at 35,000 miles and see if they notice the issue and they said there’s a bulletin out but no fix, bring it in and get it on file. Went back to the dealership and they claimed the same “sorry, smooth as a whistle” . I agree that something is being covered up. Now at 38,000 miles with no documentation with the dealership as they played me for an idiot. I have the limited power train to 60,000 miles. Keep in mind we live about 45 minutes from a dealership. Back and forth and they claim no issues.