The test drive does not tell you anything. My 2017 Denali 1500 was smooth as glass up to 6500mi. I did my first tire rotation and there was the shake. 72mph and up. I had all 4 tires balanced right after the 1st rotation, no help. Just rotated them back and lo and behold it is still there even worse. I really don't want to go through the hassle of dealing with the dealer and I also have about 5k in mods headers, cat-back, hard painted tonneau, bedslide, CAI, catch-can, tune. So even if I got them to buy it back it would be a nightmare. I even waited 5k miles before I did those mods just to see if any odd issues would pop up. Looking at the seat next to me shaking back and forth and my vape (e-cig) and glass e-juice bottle start clanking together in the console cup holder really gives me a warm fuzzy feeling inside like I'm riding in luxury.
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