We've owned 3 truck campers with the same waste hose storage compartments (or possibly similar). None of them would store a conventional sewer hose. I did buy a short 4 foot hose that collapses to a length just less than the length of the storage tube but then discovered that the diameter of the tube does not accommodate the plastic ends used for connecting the hose. If you remove the connectors, you could store the bare hose but then who on earth is going to assemble and disassemble the hose each time it's required. So, in my opinion it's just another indicator of how out of touch manufacturers are and how little they really care about the efficiencies of their designs.
I was once at a manufacturer production facility and asked the head tech what this compartment is intended for if you can't fit a sewer hose in it. The groups of techs all looked at each other and sheepishly just shrugged their shoulders.
I may have misunderstood the OP's description. I interpreted it as an issue with the molded tube compartment in the outside wall of the camper. I did not realize he was talking about a bumper storage issue.
I use mine to store my siphon hose/ primer bulb that I use for moving gasoline from containers to my generator.
