As I come to terms with the fact that the only item on my bucket list - an electric VW Camper (i.e. new Bus) may not actually be in my future, I'm imagining something like the Egoe Nest Tramp for my Prius. And no, they don't make them for a Prius, but then I'm wondering whether it wouldn't be possible to make one myself... https://www.egoe-nest.eu/en/tramp/
I think I'd welcome the opportunity to DIY it ... spend less money on the fancy framing around things, more on nicer things ... 12 volt fridge rather than "cooling bag", mini instant pot rather than generic gas cooker, etc.
As a union carpenter and a major tinkerer I looked at this then went out to look at my second gen trunk. In about 3 minutes I have a basic plan on how to build a Prius version. Unless you are close to western Pa you would have to do some DIY mods behind the panels to support the slide out track but I could do the framework for you and ship it (or do a full drop in kit if you prefer. If you would want to talk about it drop me a message
That's amazing! I didn't know they made something like this that would fit our car perfectly! Now I'm on a mission! lol