2008 when it had the 2008 MY Suburban. Twelfth generation (2021) On December 10, 2019, Chevrolet introduced the twelfth generation Suburban at Little Caesars Arena in Detroit, Michigan. This time around, GM chose to introduce the Chevrolet full-size SUVs first. The GMC Yukon XL was later introduced on January 14, 2020. Although the full size fifth generation Cadillac Escalade made its debut on February 4, 2020, its extended length sibling Escalade ESV was the last GM full size SUV to be introduced online in April 2020 after it was withdrawn from the canceled 2020 New York International Auto Show. Originally scheduled to start in April 2020, GM began production on the Suburban on May 18, 2020. They began entering dealerships in June 2020. Chevrolet Suburban 2021 Based on the same GMT T1XX platform as the Silverado 1500, the Suburban distinguished itself by swapping that truck's live axle and leaf springs for an independent rear multilink suspension setup with coil springs, thus lowering the floor of the vehicle and creating more room, in both the cargo area and the second- and third-row seats. The Suburban expanded its length to , and the wheelbase to while shortening down by longer due to the rear wheelbase moving back by , making it the largest and longest SUV in the extended length segment. It gains of cargo space behind the third row and of third-row legroom. The towing capabilities were increased with the twelfth generation models. The trims feature the primary basic LS, LT, and Premier levels, with the 4WD-exclusive Z71 and RST moving from package to premium levels, along with the newly added High Country level, the latter being the top of the line. Chevrolet rolled out the LT, Z71, Premier, and High Country levels first, with the LS and RST levels arriving in late Fall 2020. Quad exhaust tailpipes are added to the vehicle, giving it a more unique look, although this feature is only standard on Premier and High Country. This feature isn't offered on the LS, LT, Z71 and RST because of their configuration as regular base, off-road, and street-centric level trims respectively, nor on all trims with a Duramax option. The RST Suburban, which had photos released in April 2020, has a unique fascia and a sportier design similar to its Cadillac Escalade ESV Sport level trim. Both Premier and High Country trims have power-retractable assist steps that was