Using those search resources, I found a sewer storage project utilizing SQUARE PLASTIC FENCE POSTS. (one with a neat slide out tray utilizing plastic gutter) Advantages were: Able to load Rhino hose with ends attached, sewer gas trap thingy and valterra adapter in the tray and not lose anything. Tray might be used as a ramp for a long sewer run...
Easy project with minimum tools and expertise required. Heck, I did it! all materials available at the local big box hardware or maybe the farm co-op. here is one.
http://hulahutrvmods.blogspot.com/