Fairly new TT owner myself, but purchased RinoFlex based on previous FR Forum comments. I thought I would want to store in the bumper but looked like I would have to take it apart so I haven't bothered with it yet. Usually in a hurry anyway after taking a dump...
I would rather not put dump hose in the storage compartment near the water hose but it does have a cap I put on the end after I spray with fresh water. I also screw the ends of my water hose together. Maybe I'll figure out something better when I have the time...