Sounds like the RV park has gone with a basic package.
To get the other channels unscrambled you would need a receiver box from the cable company. Check with the office they may be able to provide a box while you are there.
We decided to go with Dish Network Satellite service I was tired of dealing with the differences in the "cable" offerings from the various RV parks. Plus the signal quality was usually poor.
Now we get all of the channels we want whereever we go as long as we can see the southerner sky.