I love this style of pop-up slide-in truck camper.
Small slide in camper RVs of the Four Wheel Camper design allow you to use an off-road truck to get to remote destinations, and the pop-top allows it to keep a low frontal area for better aerodynamics/fuel efficiency.
The only variable after that is how they arrange the interior to maximize its space. Although not my favorite truck camper interior design
, this one has some great ideas to consider for my own DIY camper.