Mine came with it and I soon found it to be in the way of luggage/cargo, so took it out for the time being. I had one in my previous SUV and did the same thing - never used it in the 8 years I had that vehicle. Probably won't ever use the Durango cargo cover either. Suggest you save your $ on this and don't buy.
I use mine all the time... Behind the 3rd row seats to shade the cargo area when I have something in it and behind the second row when I am Christmas shopping and such so people can't see what's back there... I also live in Memphis, TN
Sure it takes up some space, but if you need to cover something, you have to have it. It pops out real easy and I take mine in and out as needed depending on what I'm carrying. Depending on your situation of course, but most SUVs never carry any more than a small trunk, and the cover comes in handy.