The Model S has 60 cubic feet of cargo space. Is it an SUV?
I'm sure my parents' Caprice station wagon had more volume. That's also not an SUV.
But car categories are definitely blurring these days. A lot of so-called SUVs just look like cars with the roof bulged up a few inches and a juice to the ride height. It's weird. The BMW X6 is an ugly abomination in my book ("let's take a car, and just... inflate it a bit, yeah?")
the back may not be as spacious in as one would expect.