I have done it, it’s fine with one of the cheap hatch tent/ cover things on Amazon. I pushed the front seats as far forward as they would go, put some storage bins that were the right hight in the rear foot well, added an inflatable mattress and was fine. With the hatch closed it would probably only work for one full sized adult ( diagonally). Ymmv, but I slept great.
Edit: I missed the family of four part. I don’t know that many EVs would work in that scenario. 2, sure. 4? I think you need a camp trailer or tent at that point.
I have done it, it’s fine with one of the cheap hatch tent/ cover things on Amazon. I pushed the front seats as far forward as they would go, put some storage bins that were the right hight in the rear foot well, added an inflatable mattress and was fine. With the hatch closed it would probably only work for one full sized adult ( diagonally). Ymmv, but I slept great.
Edit: I missed the family of four part. I don’t know that many EVs would work in that scenario. 2, sure. 4? I think you need a camp trailer or tent at that point.