You don't need much more than a backpack or small suitcase as the washer and dryer are quite handy! (hookipabayview.com)
But don't expect to pack a lot of bags in the trunk; the lowered roof takes up most of it, leaving a space below that might fit a couple of small suitcases on their sides. (cnet.com)
Leave one or two smaller suitcases for souvenirs and toiletries. (havebabywilltravel.com)