I know you didn't ask, but since you admit to being on the learning end of the experience curve, here is something else I do in case you want to work towards it in your repertoire. This relates to dumping with a connection for a separate flush/cleanup utility hose.
I use quick-disconnects (QD) for all my water connections. This makes for a speedy camp setup (think late night arrival), and camp breakdown, and rapid connections during tank dumps. In my mind it also reduces chances of cross-threading and ruining plastic threaded connections, minimizes knuckle scrapes, etc.
- Most sites have a single spigot per camper.
- Attached to this I quickly twist on a Y-adapter with shutoffs and QD to both directions. This means at a campsite with water supply I always have 2 spigots while everyone else has one.
- On one direction of the Y-adapter I snap on pre-connected pressure regulator and freshwater hose.
- On the trailer end I spin on a 90 degree elbow already attached to QD fitting onto the city water inlet on the trailer.
- Snap on the FW hose, now I have a water supply.
For black ops and utility operations I have a gray collapsible hose. This is lightweight, easy to store, and can never be confused with the fresh water hose.
- If dumping, I put on disposable gloves get out the slinky and support
- Connect to trailer
- Connect to dump over supports (with adapter if possible)
- I spin a QD fitting onto the black flush inlet, snap on hose (which already has QD fitting.)
- I snap other end of utility hose onto the other side of the spigot Y-connector QD and turn on the valve.
- Open black tank valve, let it drain and flush for a while.
- Open gray valve, let it drain.
- Turn off water at Y, snap off hose from black flush inlet, snap on hose nozzle sprayer (which already has a QD fitting) to working end of utility hose
- Close black and gray valves.
- Disconnect slinky at trailer, hold it up and rinse thoroughly with utility hose.
- Cap trailer end of slinky, accordion it up to dump end.
- Disconnect, cap, store in bumper.
- If I used the adapter, I rinse it and hold it in one hand and peel off one of my gloves inside out over it to mostly cover it for storage.
I usually disconnect the utility hose if I'm not using it.
It is not possible to completely drain hoses when breaking camp, especially if you are in a hurry. The QDs let me quickly disconnect the hoses, then reattach the two ends of the hose to each other making a closed loop. That way the water does not leak all over my storage area in transit.