I didn't realize trunks were that big! Or maybe I'm just tall. I can't think of a reason why I'd ever need to fully climb into the trunk to get anything.
I'm not even 5'2" and I've never had to crawl into a trunk to get anything. I suppose I could, if I were say, sneaking into a drive-in, climb in and curl up and close the thing, but I can't imagine any circumstance that would require me to put my whole body in there to get something. It would have to be intentional for a full-grown woman to get into a trunk to the point that the lid could close. Maybe if it's like a 70's Buick.