Home Current News GMC Limits the Sierra's New CarbonPro Bed to a Pricey Option PackageNewsCurrent NewsGMC Limits the Sierra's New CarbonPro Bed to a Pricey Option PackageMay 20, 201993FacebookTwitterPinterestWhatsApp The carbon-composite bed in the 2019 GMC Sierra will be available on a limited basis this summer and more widely in the 2020 model.