Grandjean has several campsites, some on the river, some not.  Some of the sites would accommodate smaller truck bed campers and maybe trailer campers.  We tent camp and needed the 4-wheel drive to get to the end of the road.  I didn't see any RV sites, there might be one or two around but its unlikely that there would be hookups of any kind.  There might be a restroom off the main road on the way toward Grandjean but there were none close to any of the campsites around us.  I would describe this as remote car camping.  Established tent sites and fire pits, beautiful scenery, privacy and not a lot of extras.   The Sawtooth Lodge is up the road and does offer RV space, tent camping and cabins.  I am speaking of the rustic camping sites between Highway 21 and the Sawtooth Lodge.