After several hundred miles of dirt roads over the last few weeks, I've got a tremendous amount of dust in the rear cargo area. Some looks like it came around the tailgate gasket, but the rear sliding windows had a lot of dust on the inside of them as well (they were closed and latched). Any way to "seal" these up? Or other places to look for dust entry? I also noticed the jack/toolkit was covered pretty heavily. Does this come up from some drain holes?