We are going to be on the road for 92 days this summer, traveling about 9000 mikes. Using all available discount programs (Good Sam, KOA, and Passport America) we will be saving a considerable amount of money, based on the published rates at the RV parks we're scheduled to stop at:
Good Sam: $145 savings
KOA: $80 savings
Passport America: $212 savings
As can be seen - if you use the programs you can easily recoup the membership costs.