I think the problem might be that our car parks just aren't all that big, and there's other infrastructure that needs to be built to accompany DC grid sources like this, they don't just plug straight in.

There's lots of normal sized car parks dotted all over, very few of them are really of any particular size, and the ones that are are usually multi storey car parks to save on footprint anyway.

Not a bad idea but not sure how they'd handle snowfall.

This is the world I want