If you don't want to winch the car (truck) in and out.. look into ones with a full side door. The JimGlo I bought is ausome,,but all steel frame / aluminum skin, floor inner skin, insulated,, nice but JimGlo is pretty proud of them. The 24' "HotRod suite" is just under $20k but with 4wheel electric brakes, electric door, hydraulic toung jack, winch on rear ramp/door, electric remote release for side doors ,, it's a nice piece and airflow through it with side and doors open makes it 'tolerable shade' in the summer day races.
http://www.small-block-chevy.com/trailer.htm