Just got back from a 5 day trip to East Fork Rock Creek Campground in the Sierra Nevada Mountains here in California. We were there last year and had a spot across the road and had to fill our 27 gallon tank before backing into our spot. When we signed up in January we were lucky enough to get the spot across the road that had the spigot. So with our water hoses carried in the trailer we were able to fill it up whenever we wanted. I might carry a couple of 5 gallon jugs on future boondocking trips just in case, though.