My problem is that the "not on pavement" is a long way from where I live. I just got back from a 2400 mile trip in which 300 miles was not on pavement. That's a little higher than your 7% but that was just for one trip and most of my trips have fewer miles off pavement. Of the off pavement there were nearly 200 miles on real 4WD roads, this is closer to your 7%.What you don’t see is the 7% of miles not on pavement… but, it seems like you probably don’t get out there or wouldn’t be asking these questions.
Back to the original subject- don't forget that mall crawlers have to have snorkels too. It might get really deep in those parking lots.