While the value of the parking/storage space might increase the amount an RVer would be willing to pay for a piece of real estate, the value of the real estate in the neighborhood (including the lot with the RV space) might be lowered because some (if not many) non-RVers would find the parking area an eyesore.
If you are looking in an area where the lot sizes are measured in acres and the homeowners are free to park vehicles/keep livestock/plant an orchard/whatever, whether or not you have an RV would not make a difference.
