ASSIST STEPS, CHROMED TUBULAR, 6 RECTANGULAR CAB LENGTH (factory installed) (Included with (PDB) SLT Premium Package or (PDC) Texas Edition SLT Premium Package. Not available with any other assist steps.) ,AUDIO SYSTEM, 13.4 DIAGONAL PREMIUM GMC INFOTAINMENT SYSTEM WITH GOOGLE BUILT IN APPS SUCH AS NAVIGATION AND VOICE ASSISTANCE includes color touch-screen, multi-touch display, AM/FM stereo, Bluetooth streaming audio for music and most phones; featuring wireless Android Auto and Apple CarPlay capability for compatible phones (STD) ,TRANSMISSION, 10-SPEED AUTOMATIC (Included and only available with (L5P) Duramax 6.6L Turbo-Diesel V8 engine. Not available with (PTO) Power take-off.) ,WHEELS, 20 (50.8 CM) BRIGHT FACE WHEELS with dark painted pockets (Included with (RFX) X31 Off-Road and Protection Package.)