We just spent the last three nights across the street from this location. There are a few spots for large RVs at this loop, but if it's full, you can go about 100 yards past this loop and across the street to this location (48.0512793, -124.1110441) and there's a lot of room in a large gravel area that is perfect for buses and coaches. We were about to settle for a muddy spot in this loop but luckily we scouted ahead with the toad and found the area across the street. Not as wooded and pretty as the loop area but plenty of level space still available.

I usually only stay at the places identified as "Big Rig Friendly" but I gave this location a shot since a review said there were buses that found a spot… we tried it in our 40ft Class A and got pretty jammed up down a narrow road, trying to follow the directions in the comment. Disconnected the toad and ran around trying to find anything that would work but there was nothing for our size. I do not recommend trying if you're in a large Class A.