Only 2 things to say:
ACCESS in and out of the truck once it's in the trailer is a MAJOR issue with these things. They are not exactly narrow cab. A lot of enclosed have access doors on the side, 'few' have anything like my JimGlo. After 3 back surgeries and loosing a lot of mobility, I found what I honestly think is the ideal enclosed car trailer.
http://www.small-block-chevy.com/trailer.htm
Not light at 4600 pounds empty, and you get what you pay for.