If theives want it, they will take it. Sad, but, true. The best you can do, is make it as hard as possible to steal, and, easy to identify. The longer it takes to steal, and harder it is to cover identifiable markings, the less attractive it will be to a theif. We have a 5x8 enclosed trailer, and, a pop up camper. I have them parked angled toward each other tongue to tongue, tongue locks, and, chained together.I also have a spare vehicle (old Bronco II), that I am able to park over the tongue of both (I swap directions every now and then so no one ever knows if we are home or not). If someone tries to push them backwards, there are trenches directly behind the wheels, that they must fill, or, have enough muscle to push out of. I live in a very rural area, and, many around us have had trailers of all types stolen. We've never had a problem other than a propane bottle being stolen off the camper (which we never store there now).