Didn't GMC downgrade all of 5.3 SLT's to the 8 speed late last year? According to the Build and Price site right now, 5.3 SLTs get the 8 speed but 6.2 and 3.0 diesels get the 10 speeds. I would get the 6.2 or the 3.0 just to avoid the 8 speed. Sent from my SM-G965U using Tapatalk
This cover looks identical to the Weathertech and RealTruck actually shows how to install it. Start at 3:08 and you'll see that the cover latches right to the up front and can be easily removed when you need the whole bed. And it looks thin enough when folded that it'd probably fit in the bed with whatever you're moving, too. Sent from my SM-G965U using Tapatalk
My father-in-law has this on his 18 Sierra and it's bone dry.: https://www.weathertech.com/chevrolet/2020/silverado-1500/alloycover/ Sent from my SM-G965U using Tapatalk