Amongst the wide variety of tents for camping or overlanding, you will find traditional ground tents, swags, SUV tents, Roof Top Tents and then: Trailer Tents.
These are an excellent option for big groups or families, who have a trailer, and want to sleep comfortably. The trailer tents turn into pretty much a small cabin. they can be placed on top of the off road trailer, and then be extended sideways as to create enough space for 4 to 6 people to sleep comfortable inside of them.
As a matter of fact, you can even stand up inside of them. They are a great alternative to rooftop tents.