Huge glass roof to see the stars. Can run climate control all night without running engine or killing battery. Free supercharging along the way and can charge up at an RV site. Environmentally friendly.
My one question about this concept is where do you keep your stuff? If you've got to convert the back seats and entire trunk into sleeping area, it means you either put nothing in that space, or need to find another space to put it when it's a sleeping area.
Best thing I find is that if it gets cold at night, you don't have to start the car, just use your phone to turn on heat