Because GMC/Chevy is manufactured by GM, there's very little difference, especially since 2007/2008 when both the Sierra and the Silverado switched to its current body.
The door handles could differ by package, such as a chrome package would have chrome handles, etc. It also could be personal preference, such as building a truck from the ground up to purchase it for as little as possible.
I've speculated that they are involved in a crime, have outstanding warrants, etc.
I've also speculated that they are afraid. I said this a couple of threads back: Do you honestly believe that LE will accept "Yeah I saw her, but that's it!" or "I didn't see her!" from this person?
My gut tells me no. However, I'm inclined to believe that LE is not looking for this truck.
I've said this as well.
Without actually seeing the video, we must go on what LE has released to us. They said it was a "Chevy Z71".
The decals can be bought.
Also, as for removal: I've been told on newer models; you can use a heat gun or hairdryer to warm it up then to peel it off. Then use baby oil, Goo Gone, or WD-40 to remove the leftover residue.
Because we do not know the year (I've speculated that it's a 2009-2011), I've been told that it isn't recommended to remove the decal on darker trucks due to sun exposure, etc. because the truck could still have the "decal", just not in vinyl form.
No worries, we're all working towards the same goal.