I've been asked to clarify, so:
The shore water source is coming from the left (as you see it in the photo) into the filter housing. Then the output of the filter is connected to a short supply hose running to a Tee. One side of the Tee connects to the trailer's City Water Supply input and I attached a spigot with an anti-siphon connection to the other side. Now I can use the spigot like normal for filtered water. Using the spigot will drop the pressure inside the trailer while in use! For washing the trailer or other tasks that don't need potable water, I'd just use a hose directly from the site's water connection rather than running it thru the filter.
All of this including the filter bracket itself disconnects easily so it can be stowed away during travel.
2010 Flagstaff 829RGSS
Still to go: AK, NL, NT, NU, YT