My question is how much and how far do you intend to travel with the car? I have had both a 28 foot enclosed and currently a 20 foot steel deck open trailer. Heres my take on both. Enclosed 24' really is an absolute minimum length in my book. Leaves room to strap car down in front and behind it 20' you will be literally crawling under front bumper to get drivers side front strap hooked. Very nice if driving long distance and protects the car better than an open ever can. Real pain to get around town with, poor visibility, low ground clearance for uneven pavement. Really going to push the limits of a 1/2 ton especially in hills. Pull very hard in comparison due to wind drag of a giant shoe box going 70mph down the road. Open Much more versatile in allowing you to haul other loads. I use mine to haul my compact tractor and implements more than I do cars. Much better visibility 20' is plenty long since you can walk around outside of trailer to hook straps. Much easier to maneuver in tight spaces since you can see around the trailer much better than enclosed trailers. Also much more 1/2 ton truck friendly.