Visiting Utah's big 5 National Parks in a 28 foot RV this June 2020

Best places to stay while using a 28 foot RV?
Favorite hikes at each/any of these locations?
Must see along the way or at each location?
Travel suggestions for a first time RV user?

Salt Lake City   Zion National Park   Bryce Canyon National Park   Capitol Reef National Park   Canyonlands National Park   Arches National Park