Stinky Slinky storage

I've seen people who have attached a plastic fence post (Lowe's, Home Depot, cheap) to their bumper.

I use extra large zip ties to fasten my PVC to the inside of the rear bumper. Has held great for several years. I also put a 45 elbow with screw cap to get my 20 foot hose in and out. One of my better mods IMHO

Ross,
There is a fellow who came up with a pretty neat idea, whereby he installed a rotating toilet bowl flange in the sewer hookup compartment, glued on an "el" underneath, with a 3ft 4" PVC pipe, into which he puts the "Stinky Slinky".
The hose stays permanently hooked up to the grey/black outlet, snaking down through the rotating flange, the El and the 3ft pipe. It is held in the pipe with an end cap when not in use.
See here:
http://www.rvnetwork.com/index.php?/topic/127399-sewer-line-tip/

I've seen, Duct tape, bungee cords, large zip ties, large hose clamps....and and and...

I have a 20 footer and keep in in a cardboard box in my basement compartment.