’19 GMC Sierra Denali and SLT GMC has completely redesigned the next-generation Sierra Denali, and among the notables are the carbon fber CarbonPro pickup box. It’s corrosion-resistant as well as impervious to dents and scratches. The truck also has the new-to-the-industry, lightweight MultiPro tailgate, with a standing workstation as well as step and seated use. Additionally, the Sierra Denali has the ProGrade Trailering System, and the app allows for connected trailering tech to make towing easier. An available new 3.0L Duramax diesel I-6 is matched to a 10-speed automatic transmission.