I don't know when you plan to go, but RIGHT NOW is not the best time to be going. Assuming that you will be going in the spring or summer, it is beautiful country and the Boone area has some great restaurants, trails and mountains.
Friends of ours use The Little Campground and they rave about the owner, but it is hard to get into since there are very limited sites.
We haven't been to Boone to camp in years, so I have no personal recommendations. We usually go down to ski and tube during the winter since it's only a couple hours away and we don't take the fifth wheel during the snow.:S
We also use rvparkreviews and I throw out the top one or two as well as the bottom one or two to get a better "guess" at what it's really like, unless they are all glowing reviews and there are more than 10. Then, it's a must go.
2017 Ford F350 Crew Cab 6.7L 4x4 DRW