I did a somewhat similar modification to what Dick has posted on my 98 Patriot 37'. All of our coaches are likely different so plan and measure before cutting anything.
I added a second sewer hose door below the first one. Next, I added two more white PVC tubes under the top door but accessed via the new lower door. Next, I made a metal cage similar to Dick's photos and mounted it below the lower second door.
In Dick's version, you can put longer hoses in the cage (Like 20'). In my version, I have three shorter hoses all configured differently with various fittings including an extension hose and use whatever I need at any particular campsite or dump station. My cage is accessed via the second door, I keep all kinds of adapters like see thru fittings, sewer hose c lamps, sewer rings, hose couplers, and the like. These are all very lightweight. I actually made my cage from bent 90 degree pieces of perforated aluminum and tied them together with Panduit Ties. Fast and easy and quickly removable should you ever need to.
I have had this setup for over 10 years now and just love it. I have also used this same concept to store lightweight items in a few other areas of available storage elsewhere in the coach.
Larry