One problem related to spare tire has been reported for the 2004 GMC Envoy. The most recently reported issues are listed below.
The spare tire release does not work. You are supposed to raise the jack up to the spare tire and it will push the spare up and release I the release bent as well as the jack. We will now have to cut the wire if we ever want to use the spare tire. This should have a normal release or metal plate holding the spare onto the bottom of the truck.