When I had my container delivered, I asked the guy about picking it up if I ever wanted to get rid of it. He says sure, I use the same rollback and winch it up. So yes, the whole thing can go away but you have to realize that if someone wants your stuff that bad that they'll get it nomatter what you do. The best you can hope for is to prevent them from ever knowing you have stuff there or to make it so hard to steal that they give up. If they want it bad enough, they'll get it.
This last weekend I see that someone went to my property, used a pipe cutter to cleany cut my pipe gate enough to slip the lock chain through and then proceeded to steal lumber from an old building. They drove their truck right to the building and did the work by hand. They then left and replaced the gate so it looked undisturbed. Quite a lot of nerve considering that there is only one road in and they would be stuck there.