Originally Posted by Springerdad
My sob came with an undercarriage hose storage tube that was too small and too short to be useful I went the 5" fence post and 4" gutter route with 2 units that I can store all of my sewer equipment outside and under the camper. There are several threads with pictures to see. Mine might even be in one. Search is your friend!
I installed a 8' x 5" vinyl fence post under the belly liner, parallel to the axles, attached to the frame with large hose clamps. It holds one 15' and one 10' Rhino hose section complete with connectors, a 45 degree clear connector and even the hose rinser. "Fence post caps" cover the ends, locked in place with 2" pip pins drilled at a 45 degree angle on the corner.
90% of the time, I only need one hose section, accessed from the dump side. If I need the second section, it is accessed from the steps side, but both can be returned to storage from the dump side.
I use the frame-mounted factory storage tube (too short, too small) for a single "in line" Rhino hose section for unusual cases - I've used it once in 10 years.