I have a 2017 fifth wheel and the RhinoFLEX hose will not fit into the under-frame round hose storage pipe designed for that purpose. RhinoFLEX hose ends have a larger diameter than normal and they are becoming very popular. I am sure it would not fit in many of the class C square bumpers I see. Sometimes complicated technical things like this take the RV industry a while to figure out.
I store the hose in a plastic storage container and use the factory compartment for fishing poles.