http://VacavilleGMC.com (866) 593-1568 The 2012 GMC Acadia is a large crossover SUV offered in five trims: base SL, SLE, SLT-1, SLT-2 and Denali. An eight-passenger seating configuration with the second-row bench seat is standard on the base SL and optional on the rest, which get a standard seven-passenger configuration with second-row captain's chairs.