You are correct here, I to have a 2002 Yukon xl with 119,000 miles, bought it new and love it. Back then there were several plants building them. Now there is only one, in Arlington TX. They are building them as fast as they can but I think most of the problem is in design. Also I think some people are more or less susceptible to low hearing tones/head pressure so some just are not bothered by it. Two things I probably should not tell you all so don't give my name. 1, The 2018 pick up is getting a complete redesign and I here it is great looking. So look for it late 2017. 2, the phone number to the head of quality control in the Arlington TX plant is 1-817-805-0906.