I was there in 2017 (my pre-Campendium days) and managed to drive my Rialto (22' VW class B) up the mountain. Best advice - pay close attention to the reservation details, site length, equipment, etc. I started off at a site that was in no way set up for an RV, but thanks to the host, was able to move to a better site. It is an old school campground but SOOO worth a visit. Allow plenty of time to explore.

It's very tricky. I pulled my 16' Jayco with a F150 crew cab up that road. You can make it, but not easy.

There are a limited number of trailer sites. Last time I was there people had to move vehicles when I parked my 16'.