I've never been to a campground that didn't have water somewhere. If I am going to a state park without full hookups at the site, I just fill up at the water spigots that are placed throughout the park.
These are higher quality entry level campers... but they are entry level campers none the less. They weren't designed to haul full tanks of water over a 1000 mile journey. They were meant to fill up at the campground and then parked at your campsite.