A lot of nice places to camp, Forest Service as well as state parks in Idaho too.
1. Bull Trout Lake - Forest Service CG in the Boise National Forest. Two loops - Bull Trout, right on Bull Trout Lake and Martin Lake Loop, on Martin Lake. You would fit in both loops. Check it out on Campendium.
2. For full hookups, there's a small RV park on the Salmon River Byway, Torrey's Burnt Creek Inn. 10 sites and well spaced. In the open, but nice to have the hookups sometimes and not crowded like a couple of little RV parks in Stanley.
3. Various FS campgrounds around Redfish Lake and Stanley Lake, but depending on when you visit, they may be booked. Mid-week is best. A lot of various FS CGs along the Hwy 21 and 78 Corridors.
4. Ponderosa State Park in McCall Idaho.
5. Cascade Lake State Park north of Boise and south of McCall with various units, some with hookups, some dry. Poison Creek has full hookups, but is popular, best time for a FCFS is midweek.
6. Further north is Faragut State Park - full hookups and quite the history there since it was a Naval Base.
7. Even further north is Priest Lake and oh so beautiful. First time we camped there we had a 19' travel trailer. We were by ourselves in October with electric hookups. Water was turned off, but the FS let us fill out tanks in their yard. Then we went back with our 35' fifth wheel (clearly not having remembered the size of the sites), and couldn't fit anywhere. We spent the night there in the overflow parking lot, but still an experience.
What we found is that a lot of FS campgrounds in Wyoming and Montana have electricity, whereas that is the case in Idaho. We often to to Falls CG off the Togwotee Pass in Wyoming. Two loops, one dry and one with electricity. At 9k in elevation, it's nice to have the electricity to ward off the chill in the fall, which is when we travel most.
Enjoy your planning.
2011 Bighorn 3055RL, 2011 F350 DRW 6.7L 4x4 Diesel Lariat and Hensley TrailerSaver BD3, 1992 Jeep ZJ and 1978 Coleman Concord Pop-Up for remote camping
Dave & Renee plus (Champ, Molly, Paris, Missy, and Maggie in spirit), Mica, Mabel, and Melton