When I got my class C the previous owner had a nice sewage hose with the modern bayonet lock-on fittings.
With these fittings the hose did not fit into the original storage area, which was simply a short aluminum tube behind the wheel well:
So she had a custom bumper pipe built using non-stock fittings which cost over $200 and was very large and heavy:
You can see the hose is a small fraction of the pipe.
I wanted to get rid of this giant pipe so I started hunting around in the original storage area with a tape measure and visualizing possible solutions.
With careful measurement of the available volume I started putting together a PVC pipe cage. You can see the hose fits easily within the volume of the cage:
Once I had the basic form and checked the fit, I added more PVC and started gluing it all together. The downward bend goes around the gasoline filler pipe:
BTW, I always use
Gorilla PVC PrimaGlue. You don't even have to use a primer for pressurized lines and it does not have the terrible volatiles of other PVC cements. I have used it on many dozens of fittings and it is marvelous stuff.
Once the cage was built I covered it with 1/2-inch hardware cloth, securing this with pan head screws and wrappings of copper wire:
Then I lashed the cage into position using some old 2-inch seatbelt webbing secured with pan head screws:
Finally I enlarged the old opening so the fittings of the new hose would fit through:
Removing the big pipe saved weight and freed up space for other uses:
After thousands of miles of driving I have been very pleased with this cage. The sewer hose dries out quickly in the airflow under the RV.
Just tossing this out as an example of how space can be used.