Requires 2WD Denali Crew Cab Brief Mattress with 5.3L V-8 gasoline engine. Requires 4WD Double Cab with accessible 6.2L V8 and Max Trailering Package deal. Requires Sierra 3500 HD Common Cab Lengthy Mattress 2WD DRW with accessible Duramax 6.6L Turbo-Diesel …