I almost bought one of these (Maggiolina?) several years ago for my Cherokee. We were driving a lot of mining trails up in Colorado and Wyoming. It looked like fun but never found the right camper at the right price.

Here is a thread on another forum.

Complete Roof-Top Tent Comparison - Toyota FJ Cruiser Forum

The one that looked like the best deal was too scrungee. It smelled like it was put up wet and left to mildew.