Let's see if I can explain this better.
Imagine my trailer:
With this tent on top of it:
Parked where the SUV is in this pic:
This way I have my comfy bed in the trailer and use the extra tent more as a sitting space on cold weather campouts, someplace to get out of the wind. In the summertime I'd just use something like an Easy-Up awning.
Here's another pic of the SUV tent:
Or maybe something like this would be better:
Well, maybe that one's a little overkill.
Hope that makes more sense, take care, Guy