My trailer is a 2000 Haulmark 20 foot, its wide enough that I haul my 92 D150 short bed / regular cab in it also . I can't open the truck doors when it is in , I used to crawl out thru the rear sliding window now I have a winch and just pull it in . I can see how the extra side door would make it easier, I personally don't like the looks of them . My local trailer dealer has several ATC aluminum trailers in stock , practically the whole side of the trailer opens up to gain access to the drivers side door , thats a awfully big door to try and seal from the elements and to me just looks like a problem waiting to happen. Evidently others feel the same way as the trailers have been there a long time and they keep dropping the price.