A couple of notes. First, I'm really not sure where to post this, but it said try here first, so I'm trying here first. Second, I've also posted on another forum hoping to maximize my chances on finding someone who can help me out. Does anyone have a list, or a link to a site with a list of all of the RPO codes for the OBS trucks? I haven't found anything with multiple google searches, and didn't really find anything with the forum search. I'm not looking for a VIN decoder, or an overview of all RPO codes for all GM vehicles (both of which I've found) but more just a list of the packages and options that were available on the OBS trucks. I'm honestly kind of surprised there isn't a sticky with RPO codes for the different generations of trucks already. The ones I'm aware of so far are: KNP, UY7, VR4, Z71, Z82, Z85 and then G80 and F44, but I'm not certain weather those are OBS or NBS or both. Anyway, thanks for any help as always P.S. as a side question, does anyone know if you could get the Z71 and Z82 on the same truck?