True, if you regularly haul around a lot of people the rear glass might be nice. But most of us are using that area for storage space; building shelves and pull-out drawers and such. As I mentioned, I didn't even realize mine had glass back there until somebody asked about it. I've had 1 person in the 2nd row of seats one time. Otherwise, we only use the front seats. I plan to toss the 3rd row soon enough and use that as storage space. The second row I'll keep in case I need to carry passengers at some point, but I do plan to pull out the center seat and replace it with a refrigerator similar to the ExPo LR4. With that use in mind, I think having lighter weight aluminum up in the roof would be preferable to heavy glass. I can always throw a couple extra LED lights in the overhead if it's too dark.