In southwestern France is a company called Beauer, which manufactures extendable caravans. You've probably seen "slide-outs" on RVs before, but in this case the slide-out triples the square footage:
My French isn't great, but in the first part of the video he's saying this is the new generation of their product line, more comfortable, more customizable than previous iterations. In the second half of the video he loses me, but I'm 99% sure he's commenting on American politics since that seems to be all anyone can talk about these days.
Here's a longer, unnarrated and unedited video that gives you a good look at the interior and its features:
They're also working on this big-ass model, below, which should be ready by 2018.