Enclosed car trailer questions - before I buy.

I'm surprised nobody ahs mentioned this yet but do you really want to store your car in a trailer that could easily be stolen?
Matt,
car storage on my 14 acre property is easily solved when I put my 24,000lbs excavator in front of it. Lol! You had no idea where it was being stored. Not a drive way or parking lot.
I am going to build a new building for my cars but need something for this winter storage. I like all my cars under cover and sealed up.