I picked up a rental advert just yesterday for an RV site with an "executive suite" at The Great Outdoors (Titusville, FL). The owner wanted $1300/month + tax (11%) for the first month and then it went down $100 per month for each subsequent month. At 6 months or more it was $900/month but apparently if you stay there more than 6 months then the 11% tourist tax doesn't apply. Electric, TV and wi-fi additional.
Not sure if those rates would be considered typical, but TGO is a very nice resort and that site was more than just a parking pad.