Camping in yellowstone park

We want to plan a trip to yellowstone park this summer sometime late june. I am just curious if anybody has camped there in the last couple years. I know there is only 1 site [edit - "campground"] there that has full hookups but I am told it was like camping in a parking lot. I would like to know if anybody has camped at the other sites that have no hookups with there trailmanor. I should have mentioned that we have a 2004 3124KB. Also If anybody has camped outside the park which campgrounds are nice outside the park. Thanks in advance Lloyd Mock.