There are spots for a 40’. If you look on google maps you can see some of the areas.

That depends. If your rear overhang is more than 4-6' you may drag going down and back up the creek crossing. I have a 30' with my rear tires about six feet back from the back end. I dragged my rear hitch even after taking the car and tow-dolly across first. On the way out I went very slow but still dragged it about three feet. No damage though. The campsites are rough with a couple that might be worthwhile going into. It is worth a walk-in, or drive your car in first, to assess it to your satisfaction. I enjoyed my three nights there.

You can access state trust land on Hwy 60 E at mile marker 207. Any size rig will fit in through that gate.

We did it with 43' fifth wheel but stayed in one of the spots closer to entrance of area.