can a tent be put on a camper site? we will pay the camper fee amount. is that allowed?

Yes

If an RV is also occupying the site there is an additional $12 a night fee that can be paid upon arrival. If there is no RV, 2 tents are allowed at the RV rate of $25 a night.

I've seen tents countless times. If you doubt it you should call. As far as I know it's $12/night for anyone who camps

We just did this on memorial day. I think as long as they have open spots its okay. But if someone comes to reserve a camper spot with a camper they give it to them.

I'm pretty sure it's allowed, there's also primitive spots scattered around for tents. I've seen people pitch tents just randomly throughout the park too