Size? Vans are often less vanity sized, bumper height wise. But that's not really what I meant. When I want a vehicle that can store a bunch of stuff, sheltered from the elements and thieves, like materials or tools overnight, a van comes ready for that, stock. I don't need to add a whole shell or a flimsy cover, they're just good. And I can stick lumber all the way to the front of my passenger seat and not have to have it sticking out of the back. Vans are just superior in most transportation cases.