From a New Atlas online article:
French company Beauer has earned a lot of attention over the years for telescoping teardrop caravans that grow double or triple their size at the push of a button. Now the company’s bringing its tech to van life, launching a plug-and-play module that grows to create a large camper at camp and a smaller, nimbler van on the road. The X-Van installs in 10 minutes and extends the length of the van to add comfy sleeping quarters for two, giving a mid-size van the length of a full-size model.
After popping the tailgate, the owner merely hits a button on the pillar next to the driver seat and watches as the electrically actuated module sets up within a minute’s time. The only thing left to do is pop the expansion panels on the module’s sides to increase elbow room inside. The 25-mm sandwich construction keeps the temperature comfy inside.
One of the most refreshing companies currently converting vans is 
The camper is a light, mobile dome made of FUTURELIGHT™ material and heavy-duty geometry. As the fabric stretches over a geodesic dome, it creates a natural, weather-proof space. Somewhere to sleep after a day of hiking, or a place to take cover when nature is being, well, nature.
Rivian has demonstrated a fully functional, 
Boomers Daily 