UPDATE: Hello all. Typing from the campground now.
As a temporary measure I got the little garden hose off valve from Dollar General and put that in the tool box just for this weekend.
TOday when I turned on the faucet using the campground water supply the water worked and then stopped. I still had pressure on the campground side of my filter, regulator, and pressure gauge and up the hose to the city water connection. Nothing coming into the RV itself. Turned the pump on to finish the dishes.
Went outside and turned the supply off, bled off the pressure, and turned the supply back on and everything worked again as it should have from the campground water.
Is it possible that there is a way that valve has gotten all fowled up inside there and when I bled off the pressure and returned to normal?