The ski door is an itty bitty flap that opens from the trunk into the backseat so that skis and poles can be laid in the trunk, but protruding partway into the car. It is NOT big enough to crawl through, although I did certainly give it my best effort. ;)
All was well in the end, we made it to Hawaii (albeit late at night and in the pouring rain) and it was the best vacation ever.