2018 CHEVY EQUINOX PREVIEWby Jim Corbran, Automotive ColumnistGetting a leg up on the competition, Chevrolet has given us a preview of its new 2018 Equinox SUV.Introduced for model year 2005, the popularly-sized, not-too-big/not-too-small Equinox is currently in its second design generation, having had a re-do back in 2010.The 2018 models, which will go on sale in the first quarter of next year, w