Gitcher:
You're a fisherman aren't you? I can tell you see because the bump is getting bigger just like a fishing story. In your OP you said:-
I've never seen speed bumps inside an rv park until we visited here in S. Austin. These things are (measured) six inches tall.
Now you say it is 9" tall which I really can't believe because that would bottom out most cars.
Then you state:-
I didn't choose to stay at this poorly reviewed RV park.
Erm... I really think you did.
Methinks you're having a bad time and this is just the "icing on the cake"... Chill out and crack a cold one or several.