Vinyl Fence Posts as Sewer Hose Storage - A few questions?

Mine look exactly like the first photo that Path1 posted. Just behind the front landing jacks.Instead of end caps, I use 6" x 1/4 bolt, allowing for air and drain.Using the corner posts (slotted), allows for ease in attaching to the floor pan using fender washers. I have a sheet metal screw at each end and three spaced down the length underneath.