I don't think you can go wrong with a Featherlite,Sooner or Exiss but there are many more out there. I see these brands a lot at stock yards- these are guys who want a good, solid trailer.  Go by a stock yard someday and see what these guys are pulling.

One thing to also consider is what will you mainly be hauling in it.  I have seen some stock trailers with rigid flooring.  I am not sure if this is the correct terminology, but there are raised grooves in the floor to provide better traction to actual livestock.  If you are intending on hauling a comination of horses and cattle, you might want to look into the flooring system.  We have a friend that has a sooner stock trailer, and I have seen there horses have difficulty getting their footing when tied in these trailers that have this type flooring.  If I was going to buy a strictly stock trailer which meant I had to haul cattle, I would consider the Gooseneck brand.  They are well constructed and their doors and latches are made to handle a large amount of pressure.  Everyone knows a load of cattle can put a strain on the toughest of hinges and doors.  These trailers are made to handle heavy weight shifting loads of livestock.  I guess it depends what all you want to haul in it.

What do you want in a trailer, how much do what to spend? I'm sure there are many good brands out there; I would look for the best value for the money. Deal with a reputable dealer who provides service, look at warranties, check the ease of how the gates release. My opinion in your area, I would consider the Exiss trailer, I know these trailers, they have one of the best warranties (3 years on most everything and 7 years on the structure). Look at the framing; Exiss has 4" I-Beams under the floor which are 12" on center, also they have 7,000 lb axles standard. Hope that helps with your decision, good luck.

Correct. For the money the Exiss STK can't be beat. Its 7/3 warranty is awsome, they have one of the stoutest floors in the industry, and are a sharp looking trailer! Not sure what size your looking for but here is a good deal on a 24fter-

http://www.horsetrailerworld.com/home/trailerdetail.asp?ID=69387