Good advice. Talking to the track manager usually results in a good experince in my opinion (experience). They are usually very helpful and want you to have a good experience.
I usually park my trailer with the tailgate up against something so it can't be opened. Thought about chains, etc. but a good Home Depot pair of bolt cutters makes it all a waste of time.
Many years ago after racing at a Naval Air Station with SVRA I had to leave my trailer and race car. I told the Base Commander my problem. He said "Don't worry about it I'll put a Marine on it. Semper Fi.
1963 Corvette Grand Sport Roadster