We used the Woodalls guide extensively to decide which parks to use.  Woodalls (www.woodalls.com) assigns two ratings to each privately owned park.  One rating is assigned to the facilities at the par (sites, roads, service buildings, restrooms, hookups, etc.).  A separate recreation rating is also assigned.  Parks are give a 1W to 5W rating, where more Ws generally indicate the presence of more development at the park, and  more facilities. We made our choices based on the Facilities Rating.