In quite a few of the campgrounds we use, where there are shared spigots, attaching a hose and filling an on-board tank is not permitted. If any reason is stated, it's to prevent contamination of the water system. In rare cases, I've seen back-flow preventers on spigots, but more and more campgrounds just prohibit attaching a hose. We have a couple of short hoses (one is a 1' clear tubing to use in the fill tube on a tank) that I have attached to fill jugs, when the spigot is at an inconvenient height. In one campground, the spigot was at my shoulder height, one reason we added the hose to our collection - filling a jug was not possible for me, I had to depend on my husband to fill the water jugs. If we need to fill the on-board tank when we don't have a water hook-up, we just carry water to the site in our jug and use the "rattle siphon" to fill the tank. Since we only have a 20 gallon tank, it isn't all that bad - I actually used that method to fill the tank halfway at home before the last trip. It was easier than dealing with the 100' of hose we need to reach the tank from the hose bib.