2018 GMC Yukon XL SLT For Sale. Features: SLT PREFERRED EQUIPMENT GROUP Includes Standard Equipment, WHEELS 18" X 8.5" (45.7 CM X 21.6 CM) BRIGHT MACHINED ALUMINUM (STD), SUSPENSION PACKAGE PREMIUM SMOOTH RIDE (STD), SEATS SECOND ROW 60/40 SPLIT-FOLDING BENCH power... via GetAuto.com