There is a free dirt parking lot with no facilities, but if you continue to the end of the road there is a pay lot that is flat and paved with running water bathrooms. You can always park in the dirt lot and walk/roll over to the bathrooms too.
This is a super fun area and I can’t wait to go back! Its rocky and I like that. The one thing that causes a problem for adaptive riders is all the big ruts. I had to get help in a couple spots so it needs to be rated aMTB2. If you are by yourself, you should be fine if you stick the main trails and fire roads though. The route provided here is what we did. There is a section of single track called Crest Trail that would add a significant distance, but we opted out until further recon can be performed.