[kdub627]

One of my pinstripes is peeling off on my passenger door. To me that is very aggravating since this is a 2008 4runner with only 19k miles.

Should I go tell them to replace it? or is that my own problem?

[toto]

The pinstripes aren't factory - the dealer put them on (and marked up the MSRP accordingly).

You can certainly go back to the dealer and talk to them about it. If one is peeling, chances are the others aren't far behind. It's up to you if you would want them replaced or simply removed.