Ron & Marsha,
My Wife and I live in Idaho and have been to Hells Canyon many times and stay at Copperfield campground......BEAUTIFUL SPOT! Also here is a website www.publiclands.org
. Another one is www.rv-clubs.us/idaho_rv_campgrounds
. We also like Three Island Campground near Glens Ferry, ID and Massacre Rocks State Park near American Falls, ID. We recently drove and did some research north of Sun Valley, Murdock Camground and North Fork Campground (no hookups). If you are interested in campgrounds in the Boise area contact me and I can give you more information because we live in that area. If you have a RV over 30 ft in length be careful when checking out campgrounds in the mountains because many of the mountain campgrounds have a limit of 28 ft (ours is 34 feet so we are careful in choosing spots).