Not every Silverado has the rear spoiler. Out of the 600, how many had rear spoilers? Not every Silverado has a sliding rear window. It of 600, how many has sliding rear windows? GM sold 575,600 Silverados in 2019. Using your dealer's math, 9/600=1.5%. However, the percentage would be higher via reducing the denominator because we remove the solid rear windows and/or trucks without spoilers. To keep things equal, I'll use the 1.5% we obtained above. 1.5% × 575,600 = 8,634 trucks. For 2020 the numbers are slightly bigger. 1.5% × 594,094 = 8,912 (round up because you can't have part of truck sold). For 2021 we have sales numbers through March. 1.5% × 126,591 = 1,899 trucks. Multiply by 4 and we'll see approximately 7,596 (sales numbers appear to be down for the 1st quarter). At present, there are 19,445 trucks that have had the leaky rear window, and estimated to be approximately 25,142. This is representative of your dealer's 9/600. Looking at the numbers, this is not a minor or nonexistent issue. At the end of the day, all your dealer friend cares about is getting paid. He doesn't care if the money comes from GM or a customer. Having work to do is job security. With that said, I haven't experienced the leaky rear window yet, and I hope I don't. 14,000 miles on my 2020 Trail Boss that I've owned 8 months. I love the truck, and hope it stays that way. Sent from my SM-N960U using Tapatalk