For what exactly? To allow you to carry more stuff, or for you to have more space for yourself? Open space filled with just air can be a great feature for many of us.
It’s obviously very subjective because they are competing interests, but I don’t like it when designers cram more stuff into an RV at the expense of space to move around. I’m more important than my material stuff, which I can leave at home.
European designers seem much more aware of this. Given any size unit, they appear to provide more space for humans by reducing content.
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