I have a simple Toyota Yaris, I manage to put INSIDE it my huge e-mountainbike (29" wheels, 30+ kg, that thing looks like a tank) and my inflatable 2-seat kayak, along with a suitcase and safety equipment, when I go on vacation.
This might look a bit extreme, but on the other hand SUV people should need to realize they don't need 5 cubic meters of air around them to go from point A to point B
To be fair, I'm alone in the car. The kayak (deflated in a bag) sits on the passenger seat and the paddles go diagonally across the car, but it's fairly easy to fit it all