2018 Yukon Denali. SL comes with keyless ignition and entry, cruise control, 17-inch alloy wheels, a leather-wrapped steering wheel, a rearview camera, two USB ports for the front seats. The SLE trim adds an auto-dimming rearview mirror, a compact spare tire and a handful of interior trim-piece upgrades. SLT trim gets you leather upholstery, low-speed forward collision warning and mitigation with automatic braking, lane departure warning with lane keeping assist, and automatic high beams. The Infotainment II package adds navigation and a seven-speaker Bose stereo system. Also available is the Preferred package, which includes a power liftgate, driver-seat memory settings, a power passenger seat and a heated steering wheel.