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For a rooftop camper you leave the complete inside of the vehicle free for both passengers and whatever supplies and gear you might want to carry. The camper generally has to be mounted on a rack which must be installed onto your rooftop. The campers themselves ar essentially a tented bed which can fold out to be moderately spacious. They often have small pull out canopies. The fabric of the camper could potentially be susceptible to cutting, lacking the defense provided by the walls of a pull behind camper or vehicle cabin. Since the camper must be put away in vehicle movement, I don't see the difference in clearance be too much of a problem for anyone who is conscious of it when off roading, and the added weight probably isn't much overall. Some would argue that campers make vehicles stand out more and be more attractive targets.
Trailer campers which are pulled behind the vehicle can range from something like a tear drop camper to an Airstream or full size RV. Here I would be considering something smaller with which I would be able to take through trails and paths. Even for the smaller two wheeled campers there are still many variations in size and style. These campers both preserve the interior space, they also add additional space of its own, and if solid enough could support a rooftop camper of its own. The trailer can have both dedicated sleeping space and something like a kitchen space. The non fabric walls can be sturdy enough to keep most things inside relatively safe.They could however severely affect the offroad capabilities of any vehicle whilst it is pulling them, which could make certain campsite destinations inaccessible. They also attract attention as well, even moreso than rooftop campers. Special accommodations have to be made for pulling them through certain terrain.
What do you guys think?