I still use a open trailer mainly because I'm cheap and still own one. Used to tow an enclosed with a dually, but overall this is much easier. When I travel and leave the car at the track overnight the trailer tongue is locked and the car is not on it. Seems every time I hear of a rig being stolen it is an enclosed trailer with car and contents loaded...quick and easy to hook and go. At most tracks when I leave my junk there are usually plenty of folks in RV's staying overnight nearby. It would be a major ordeal for someone to load a car onto the trailer without being noticed. I believe most enclosed trailers are purchased primarily for storage when not in use really.
