We don't wear our shoes into the camper.
They all get taken off and put in a plastic bin by the steps. Instead of a lid, we just slide the bin back far enough under the camper that no rain can get in. When it comes time to move, the entire bin gets put in the pass-thru or stashed inside the camper. It is always full of multiple pairs of sneakers, crocs, flip-flops and mud boots for the kids. It contains all the dirt an mud so none of it gets tracked on the inside of the camper...
2012 Dutchmen Voltage Epic 3795
2010 Dodge 3500 DRW MC
2009 GMC 2500 DA CC
2012 Smart-for-two (sometimes hitches a ride in the Voltage!)
2005 Sundowner Sunlite 777