As with its rivals, the modern-day GMC Sierra 1500 full-size pickup is available with a wide variety of body styles, powertrains and trim levels. Thanks to this flexibility, the half-ton Sierra pickup is nearly as adept at serving as the weekday family car as it is at transporting home-improvement supplies or towing a boat on the weekends. Our sharp Flareside Z71 is ready for the "GO". . it is known as the most popular trim level called SLE, which provides desirable standard features like air-conditioning, full power accessories and a CD player.