The GMC Yukon XL is an enlarged version of the GMC Yukon, providing 144.7 cubic feet of space when the second and third rows are folded down, and 41.5 cubic feet of space behind the third-row seats. It seats seven to nine passengers, depending on its configuration with plenty of head- and legroom; and it is available in four trims. We are going to look at the SLE, SLT, and Denali.