If you are referring to the fact that there is an open space between the cargo area and the upper structure that holds the RTT, I originally had plans to mount a light weight rack on that flat area for duffel bags or various crap that would not fit in the enclosed cargo space, but after camping with it for a while I love 3 things about having that space clean and flat. 1) great visibility when wheeling 2) everything I carry is dust & waterproof...no need to deal with a dusty bag of clothes 3) that area now acts as a huge table so when I unpack the inside, nothing has to go on the ground when you are camping in muddy/wet conditions. Here are a couple of shots during the build...the one on the left gives you a great idea of just how much flat space there is and on the right is the inside of the cargo area before I added a divider.