Wow 21 cu ft is not a small fridge lol. I have a big 30" wide one in for my condo, a Samsung RB194, it was only 18 cu ft but it was huge. I wish I got a smaller fridge, it was a bit out of place.
I transported it in the Mazda 5. You have to be careful transporting fridges horizontally. You don't want to crush the coils (even if not exposed) and you want to leave it up right and not running for at least 24 hours to ensure the oil gets back down to the compressor before starting it up.