Hi Roamer,
Welcome to the forum!
Unfortunately,S&T 2008 had poor RV park data for various parts of North America. This good news is S&T 2010 is now out and available and the RV parks are not only more plentiful but more accurate in their locations too.
Also, since it sounds like you are an RVer - here is a
link to the S&T 2010 POI Megafile which contains a huge number of extra points of interest primarly geared for the RV crowd. This file is a must have for RVers and trip planners alike. (note: it will only open in S&T 2010.)