They callit a "Hatch tent" and it provides an arrangement like a duplex-
You can have a full party arrangement in the tent, with tables/chairs/heaters and then sleep in the jeep, (quickly) closing the tailgate for security-
You can just unhook from the jeep and drive away, sealing the tent into a stand alone tent-
Mine is a 10'x10'x9'-I got for my '06 Nissan Xterra and it was a total vacation getaway-
I've modified it slightly to fit the same way on the jeep, but no pics-
They alow immediate security from bears/drunks/rangers/squirrels/Bigfeet !!
Well worth the money