I actually think the trunk space in the premium is comparable to a minivan. The minivans are NOT the extended type, like my Grand Voyager, so the space between the 3rd row seats and the liftgate is narrow. Also, DW rented a minivan once recently, had to come pick me up at another airport. There was this really dumb insert in the back of the van, like convenience trays or something, that took up all of the lower luggage space. It came out easily, but neither DW nor the rental car agency knew it could be removed, so we struggled with very little luggage space for a day.