Are there specific rv only sites, or can you set up a tent in the bigger spaces where a trailer would fit?

There are plenty of sites that are quite large that and RV wouldn't fit appropriately but has plenty of room for multiple tents. As a courtesy would be nice of the sites with the longer driveway wouldn't be take by tents unless they are the last sites available. At the top of each loop there are large tents sites and private that cant accommodate a RV

You can set up a tent on the bigger sites where RVs can fit. Those sites aren't restricted to RVs only