Clean CARFAX. 6-Speed Automatic HD Electronic with Overdrive, jet black Cloth. Odometer is 16075 miles below market average! 2015 GMC Sierra 2500HD Double Cab Summit White RWD SLE Awards: * 2015 KBB.com Brand Image Awards See the Corley difference! Family-owned for over 20 years, providing an uncompromising LUXURY experience on every purchase!