Depending on how hard you are on equipment and how long you want it too last, the Ebay trailers might not be for you. Need to watch because most of these companies make an 'entry level' trailer. For Haulmark, it is the Cargo trailer. These aren't built near as sturdy. They have luan walls, the studs are further apart, etc.
I picked up a 6x14 with additional wedge front (17' interior), extra height, side door, vent, gravel guard, 3/8" plywood walls, 3/4" treated floor, sray on stuff on the under side to prevent rusting, interior lights on a wall switch, spare tire and mount, 15" wheels,2 big flood lights on the back and 2 big flood lights on the side with the door all mounted to a wall switch...got the whole package for $2600.