DrewE wrote:
The few that I've seen have a fill tap (or several) somewhere. Frequently the ones scattered about the campground are not threaded, but often there are also threaded ones for filling RV tanks--possibly by the dump station. (I'm not, of course, talking about the rinse hose at the dump station, but often there's a separate potable water tap nearby.)
The campground maps for both parks indicate water taps scattered about the campgrounds.
I saw the water taps, I just wasn't sure if people pull the trailer next to them or make a few runs with a container.