Paint pealing, but i'm only aware of that on black trucks.
Peeling paint doesn't sound like something that should be happening no matter what the color.
From GM: Corrosion Protection
GMC vehicles are designed and built to resist corrosion. All body and sheet metal components are warranted against rust-through corrosion for 6 years or 100,000 miles, whichever comes first. Application of additional rust-inhibiting materials is not required under the corrosion coverage and none is recommended.
Now some parts of the interior trims do have a tendency to peel over time.