I finally got around to making this mod. I had two 3' leftover scraps from a signpost job I did years ago, so I joined them with wire ties and suspended them under the trailer with a steel cable from one frame rail to the other. The split between the two pieces is probably good for drainage when the hose is put away wet. Two things I like about this arrangement is that it's convenient to have it right alongside the sewer drain and even more, the inside of the PVC will never scuff the hose like the inside of the rusty bumper does.
Here's the side view, the end is secured with a blue vinyl snap tab:
And here's a view from underneath:
1992 T-2470 (now residing in South Carolina)
Current Sunline-2007 Solaris 2499
2018 Silverado 1500 w/Max Trailering pkg.