Running only off of onboard tank

i fill fresh tank about 1/2 full before we leave home to use on bathroom breaks on the road. when we get to campsite i hook up to campground water with pressure regulator. i have a fresh tank/city water lever on my water hook on TT. i finish filling up fresh tank, turn off campground spigot valve. leave hose connected to TT so i can refill if needed and use fresh tank for our water supply. i have found the water pump gives us better pressure for taking showers than campground water. when we go to bed, and if we leave TT, i turn off water pump so no bad surprises with leak while we sleep or are gone for awhile. works for us. if there is a sudden leak with pump on we will hear it.