I own and drive one of these 4 wheel steering trucks already. It was made in 04.
Quadrasteer is the name of a four wheel steering system developed by Delphi Automotive while under the ownership of General Motors for use in automobiles. It was available as an option on GM's full-size pickup trucks and 2500 Suburbans for model years 2002 through 2005.The system enables the vehicle...
https://en.m.wikipedia.org/wiki/Quadrasteer