Originally Posted by Automobilist
If you don't want to stay in a big developed campground, try Holcomb Valley Campground. Forest Service, just a couple miles north of the lake.
If you go to Holcomb Valley make sure you use Van Dusen Canyon Rd (3N09) and not Polique Canyon Rd (2N09). I haven't been up there in years but back in the day I made a lot of trips to the Boy Scout camp up there and Polique Canyon was a horrible road but Van Dusen Canyon wasn't bad. That said, I didn't RV at the time and paid no attention to its suitability for anything more than a car or pickup. Basically, Van Dusen Canyon may not work for you but it is certainly the better of the two options.