That could have been the "setup" for a later visit......they probably cut the locks, then figured out the whole rig was available, or were coming back later to gather what they wanted.....
Sounds like you dodged a bullet.....
My instinct would be to leave it the way it was, disable the motorhome, and wait for the lowlifes to return and bust their azzes in the act......but life must go on.
You have to question the integrity of those in charge of "securing" the area too.......inside jobs are too easy.