Hopefully not too late of another use for the 3M bra material........
It might be a good idea wrapping the rocker panels, wheel openings and lower rear body sides (aft wheels) in order to reduce rock chips etc which eventually contribute to rust? The entire wheel opening could also be done, extending the wrap to cover the body side sheet metal far enough underneath to essentially encapsulate the entire painted areas.
Since your van is new now would be the time to do this----it might pay huge dividends in the longer term.
3M makes incredibly great products for so many aspects of vehicle protection----not to mention the million or so other products they offer too!