I never stay in a regular campground in Utah, I always boondock, or what the Gov't agencies call 'dispersed camping'. You can boondock on national forest and BLM land for free, but there are no facilities and no hookups. You would watch for gas stations that have dump facilities. Some private campgrounds may allow you to dump and fill up water for a small fee when you are not camping there. Popular boondocking areas, like along the river outside of Moab do fill up so you may have to go farther into the public lands to find a spot. This works well if you have a small rig, those with big rigs may find boondocking more challenging. especially if you have to turn around in the boonies to find a spot elsewhere. Using Google Earth can be helpful.