I used that same method for my RV trailer, but I used 4 stands and no weight on the tongue.
My stands were tall enough that the tongue jack did not reach the ground, so it would not be easy to use to get the trailer off the stands.
The drums might still be the low point, just hook up and pull it off the stands and worry about the tires later.
But you are right, nothing will stop someone that is determined to take it, but that will stop the tempted lazy thief.