Living full time in an RV park can be costly and it would actually be best to just buy a piece of your own land even if you have to get a land mortgage and pay for the land monthly.
At least you'd eventually own the piece of land you park your RV on.
Living full time in an RV park is not cheap in most places and if you plant to live in an RV park full time it can cost from $500.00 to $1,000.00 per month which is not cheap.
That's not always including the Utilities either so if it were me I would just rather pay the $500.00 to $1,000.00 per month on land that I'm purchasing instead of paying rent for an RV park each month.