On every GM car I've owned (dozens) there is an RPO (regular production order) tag. These are the 3 digit codes of optional and standard equipment for that particular VIN (vehicle identification number). The tag has generally been inside the glovebox (when's the last time you've seen gloves in a glovebox?). Based on an earlier forum member @Quaid post regarding the V92 trailering package, it was said that it is listed on his glovebox tag. I just looked, my RS doesn't have a tag inside the glovebox lid. Where's your?