Indeed it did, with the car on a concrete driveway!
With the rear engine/transmission layout there's very little weight on the front wheels unless of course the 'boot' is full of luggage etc.
I'm thinking one answer might be to place a small chock behind/ahead of the tyre & reverse/pull the trailer (still hitched to the car) hard against it?
When it comes to security you can only make life difficult for a thief so I'm thinking a security chain through the chassis & padlocked to a ring-bolt set in the concrete,. Even with a hitch lock fitted 2 or 3 fit blokes could simply lift & carry the trailer to a waiting truck/van.