I am not really an expert in the car hauler field, but I have sold them new before and I am on my 4th enclosed trailer for myself. There are many things that go into a quality built and furnished enclosed car hauler, many of them are very obvious others not so obvious. to me the most important areas are the ones that get the least attention, they are the underpenings of the trailer and all parts that support it's weight. I like to look at size of beams used and their placement, crossmembers, uprights, axles, suspension, tounge construction and it's matterials, and roof bracing. Yes these areas get very little attention, and are not what everyone else see's, but they are also the "Back Bone" of the trailer and will dictate how well it behaves, tow's, handles and eventualy lives.
I do not like Aluminum trailers. I know most think they are better and their fore used by most of the better trailer makers, but I do not feel they bring anything new, better or needed to the table, with the exception of weight. Yes the will never rust, but that isn't the problem area of most trailers anyway. longevity for a trailer is based on strenght, design , matterials and build quality, not if it will rust or not. While there are good trailers built from Aluminum out there to be had, the real question is," Do you need one built from aluminum"?, and "Is it any better then the same trailer built of steel"?
Most people I talk to are under the impression that Aluminum trailers are better trailers. Most think that, because they see very large tractor trailers made from Aluminum, that they must be the best. It is notso. Commercial movers, people in the trucking industry, use Aluminum trailers for one reason and one reason only... ... . They allow more product to be moved. Aluminum trailers are by nature lighter then their conterparts built of steel. In the trucking business it is all about cargo tonage, moving the most amount of cargo in one trip. Aluminum trailers are not better then steel one, they are lighter. This is the number one misconception most people have. Why then do then continue to use Aluminum trailers? Because they make more money. Aluminum trailers do not last nearly as long as a like trailer built of steel, this is well known. They suffer from stress fractures along their weld areas, and the supportive beams themselves crack from continual stress brought about my the flexing fo everyday use and abuse. But what is important to the trucking firm is dollars, the Aluminum trailer will make more money per run because they can carry more product. Most trucks are limited to 80,000lbs, so the lighter you can build the trailer (truck also) the more wieght left for cargo. Never mind that the trailer will have a shorter service life, it's all about today and how much money you can make now.