I also made a fence post sewer hose holder, and like yourself painted it black. When I traded my previous trailer in, it was transferred to the new one. It's a huge timesaver having it right next to the dump valve. Did you also use the rain gutter inside?
Here is mine...
2020 Wildcat 322RLI
- Pulled by a 2018 GMC Sierra Double cab 1500 4WD