Your frustration level must be off the chart. Keep flogging that loaner ride and take out a little frustration on it. Hope they get this resolved for you.
Sold:These fit 14-18 Sierra /Silverado. Brand new never installed. These are gloss black. $30 shipped to the lower 48. Picture is what they look like installed.
My 2015 and 2018 1500's both had the functionality of being able to push the okay button on the steering wheel want I got a notification have a text message and it would then read it to me out loud. I miss that capability when this current truck.
I can't hear mine rattle while driving, but the top section is definitely loose. I can grab it and shake it and hear it rattle. I would think it should have a tighter lock up.
In your settings you can turn on auto fold that will fold in the mirrors when you press and(hold) the lock button for a few seconds. They will also unfold when you press and hold the unlock button.
I just ordered upholstery piping (welting) for ebay. Install is very easy as it will press into the space between the 2 panels. Here is were I'll oder my next batch from. https://www.amazon.com/Bry-Tech-Marine1-Piping-Marine-Upholstery/dp/B07TWYH9ZG