Before I bought the big size for my 2019 Yukon (not XL) I read the comments and never got a good answer what size to buy. I measured the cargo space and it seemed to me that it was enough to cover the back row of the second row. However, the large one is barely wide enough to cover it from side to side. The back of the Yukon is 50 inches wide, and at 52 inches, the big one has to fit perfectly or it won't close. XL and simply fold the excess length down.