IMO... the valve compartment is not convenient for stinky slinky storage. This especially true for Rhino or other less flexible options. So... I picked up a 64" storage tube from CW because it was about the same price as vinyl square post and caps that I'd then need to modify for easy use...
Mounted the passenger side by drilling 2 holes near inside of frame rail so the other end would be nearer the skirt. Also there's a frame rivet preventing the flat mount from sitting flush to the frame rail so I milled out the tube bracket to accommodate the rivet head for a flush mount.
Used existing frame holes to strap the tube up snug (no tension on grey water tube). Rubber isolator strapped to the grey tube to prevent possible vibration contact noise.
Cut just a bit of the aluminum skirt for easy access.
Very easy to extract or store a stinky slinky now!