I carry a 6', 10'and a 15' 3"hose. I think I have used all three twice in the last 10 years. It is usually in the parks that the sewer hookup was not thought out very well, i.e. the sewer hookup was installed in awkward locations compared to where the camper is parked.
80% of the time I only need to use the 6 footer.
For those times we don't have fullhooks I use a 10 gallon blue dumper. The smaller size makes it easy to use and store.
Here is how I carry the hoses