Need Advise on Heading South for the Winter from NW Iowa

A word about Rockport. The RV parks are mostly full due to the shale oil workers in the area. This runs from Port Lavaca to San Antonio. They are also building windmill generators in the area. I was able to get a reservation in a park that had just expanded but many do not have the room to expand. I was told they are building several new parks but they may not be ready. I suggest you call for reservations before you go. May have to go the Rio Grand Valley.