German tuner 50Ten (a.k.a. FiftyTen) has been designing large camping add-ons for Ford, Toyota, Nissan and Volkswagen pickup trucks for a while now. The standard price tag is U.S. $38,000. However, its latest module is smaller and more affordable, and targets the Jeep Gladiator.
Called the Tablet System, the box installs straight onto the truck bed and can be used as a large trunk compartment. It also houses a foldable tent with two mattresses, which you can expand or collapse on the module roof in a couple minutes. The box itself has doors on three sides, which should make loading and unloading a much easier task.
The 50Ten Tablet System costs $33,000 in the USA.