You have a couple of options. I'll be outfitting a Suburban soon and we plan to bring bikes as well. I'm planinng on putting a Wilderness or a Confer roof rack on ours. The bikes is a big reason. The big problem with a burb is the hight makes loading bike on the roof difficult. The bonus with a rack of this style is they can handle somebody standing on them. So one person could stand on the rack and another hand the bikes up.
Now I also plan to put a receiver on the front of my burb. I have one on the front of my offroad truck and it's great for moving a trailer around in a tight location. The reason I bring this up is you could use a receiver style bike carrier on the front if you had one. Much easier to load then the rook.