2018 GMC Sierra 1500 4WD SLT Crew Cab. Recent Arrival! 2018 GMC Sierra 1500 SLT Onyx Black Automatic, 4WD, Jet Black w/Leather Appointed Seat Trim. If you're in the market for a new or used car, you've come to the right place. The staff at St. Charles Nissan/ Hyundai is... via AutoRevolution