2019 GMC features industry-first carbon fiber box, multipurpose tailgate dzadmin March 5, 2018 March 5, 2018 No Comments on 2019 GMC features industry-first carbon fiber box, multipurpose tailgate A versatile tailgate and a carbon fiber bed for the redesigned GMC Sierra pickup are in addition to bolder styling, more luxury amenities and a weight reduction from the current version of up to 360 pounds.