Came up here to escape the 90+ degree heat.  Seemed like everything in the area was either booked or $70 per night, so I opted for mountain air rather than AC on my trailer.

Scenic 15 minute drive up from Sandpoint.  It's a paved two lane road with a number of switchbacks - I think even larger rigs should be fine as the hairpins were pretty wide.  Fire station and RV parking is located to the left of a large roundabout with a green Schweitzer sign.  Big gravel lot with space for dozens of rigs.  You shouldn't have trouble finding space.  There's a restroom and a number of garbage dumpsters you can use.

Per the website, you're allowed to camp there for three days.  Didn't appear to be any check-in process or anything, you can just pull up and park.

There's some road noise with a number of trucks driving by, but hey, it's a free place to camp for a few days.  Nice of them to offer this.