Not sure about campgrounds not having a dump station. That has not been my experience. Most do even when all sites have full hookups to accommodate folks who just want to dump for a fee. A look at the campground map will usually point you to their dump station. It may be away from the camp sites and inconvenient.
As to the hose, I carry a gray colored 15 foot hose with a permanent backflow preventer on it that I use when flushing and cleaning up my sewer equipment. If the non-potable spigot does not have a threaded male on the end; I just remove it and use my own hose. I keep it in the same tub as the sewer hose and couplings.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW