I live in Duluth, MN & we've got the worst weather on the planet, but I just got my truck in June, so I don't know for certain. The 3M 1080 vinyl I used is made for vehicle wraps so it should hold up fine; it has on our Challenger for the last 2 1/2 years, anyhow. I guess I'll find out in the spring how it holds up on the emblems.
You can do the emblem blackout. Just take the vinyl, cut squares of it that cover the entire letter including the chrome. Lay it on evenly with no bubbles (simple on such a small thing). Take an xacto knife or similar and carefully slide it along the inside edge of the chrome outline. That will leave just enough vinyl after you've got the letter cut out to tuck into the gap between the letter & chrome outline. If it doesn't want to tuck cleanly, use a bit of heat from a heat gun or hairdryer. You could probably even just do it in the sun to make it conform.
If it doesn't turn out, just do it again until you get it right. Vinyl is cheap.
I used the exact same strategy as TXAT4. I won't waste my time playing games at a dealership. I emailed the salesman I test drove my AT4 with a few weeks prior to let him know I was a serious buyer and prepared to buy today if we could come to an agreement. After some back & forth emails, they met my price and I went in with financing in hand and had my truck about an hour or so later. I saved $12k on a truck that the dealer had $0 marked off of. My husband wanted nothing to do with the process (which is probably a good thing; too many cooks in the kitchen ;) )
With all the information available online and the "alternative" ways to work with dealerships, I don't feel like anyone should subject themselves to sales pressure and the ol' 4-square torture we've had to endure in the past.
Good luck, ugaDAWGS09, I hope you can get what you want for what you want to pay.
So, today I blacked out the GMC emblems on the grille & tailgate on my '19 AT4. My truck is black and I like the sleek black look. This was a simple, subtle mod in that direction.
I used 3M 1080 wrap vinyl & a little heat. They came out nice and if I decide I want them red again, for some reason, I can just remove the vinyl.