A lot of off-roaders put their spare up there (as I have mine). Helps your departure angles, and larger tires won't fit underneath anymore. I also have extra lights mounted on my rack and use the extra space (what little is left after my tire) often.
Also, granted mine is a 3rd gen, but with me and my kids and our gear, there's not a lot of extra space on long road trips, but we camp and off-road a lot. I also have a big drawer in my "bed" area taking up space, too, not to mention the toolbox I always have.
You can never have enough space, imo!