I store my hoses in the rear bumper, and I use the special bumper plugs from camping world that don't allow bugs in, but still allow for ventilation. But you are right, the bumper won't store the rhino clear elbow/swivel or the elbow into the sewer. I have to take both of those off and I store them in a tupperware-like container by themselves.
2015 Jayco Greyhawk 31FS-"Scamper"
2015 Subaru Forester 2.5i Prem. 6 Spd
Blue Ox Aventa LX Tow Bar
2014 Jayco Jay Feather X23B-"Glampy"(Sold)
DW, DS, DDx2, and Bandit & Fletcher