SUV & Mini Van Sports Tents

I have seen a few tents that support the use of your vehicle within the use of the tent by way of universal vehicle sleeves. Has anyone used such a tent? And if so can these tents be used as a regular tent and if so how do they close up without a vehicle being attached at one side?

 

My friend has one of these types of tents and as you may have guessed, the tent opening has a zipper so that you can close up that section when you don't have a vehicle attached to the other side. It also has an elastic on the opening so that it can accommodate many different size trucks, vans, cars, etc.