The Mercedes-Benz GL-Class is a full-size luxury crossover SUV built by the German carmaker Mercedes-Benz since 2006. A a three-row, 7-passenger vehicle, it slots above the Mercedes-Benz M-Class in the lineup and shares the same unibody architecture. The vast majority of GL-Class vehicles are assembled at Mercedes-Benz US International, Inc., in Tuscaloosa County, Alabama except for a small number of early production 2007 model vehicles which were manufactured in Germany. The GL-Class (codename X164) debuted at the 2006 North American International Auto Show. It was released along the same time as the similarly sized Audi Q7, being the first German three-row, 7-passenger crossover SUVs on the market at the time; later joined by the second-generation BMW X5 that has an optional third-row seat increasing capacity up to 7. Except for the Acura MDX, most three row luxury SUVs at the time were body-on-frame vehicles such as the Lexus LX and Lincoln Navigator.