Haulmark Trailers are crap. We had one and the walls are tack welded together, some welds not even having penetration on either piece. Some of the welds were not even on the joint, the welder misplaced them by over 1/2 inch. The paint started peeling from the frame and inner fenders before we even had a chance to use the trailer. We sent it to a Haulmark dealer after they said they were gong to fix it, and it sat there for 3 months. They never even touched it. Haulmark re-negged on there offer to repair it and said it was manufactured to their standards, What a Joke.
I have a R & R Aluminum trailer. Frame is all aluminum tube welded 360 deg. Awesome trailer, plus no worries about it rusting out.
Legend and ATC are very good choices as well.