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I own a Body Shop in Anderson SC.I just bought a 2019 GMC 2500 in December of 2018.Drove it a week took it back to dealership for headlights flickering and vibrating going down the road driving me crazy.They change Headlight got truck back it was worse than before.Carried it back it stayed there a month with GM involved in it.They said that it was normal for this type truck with heavy duty suspension I said BS I have been working on fixing cars for 40 years and this is not normal by no means.So I have fixed my lights myself after about 3 weeks of doing different stuff.All you got to do is get a good set of aftermarket HID bulbs will help you 100%.https://headlightrevolution.com/2016-2018-chevy-silverado-gmc-sierra-morimoto-d5s-hid-projector-headlight-bulb-upgrade/ These are the ones I used I love my truck now.Don't know why GM couldn't have figured this out.