Jorge, hate to be so simplistic, but trailers are trailers. It's aluminum I-beams, normally American Rockwell torsion axles, etc. Price is where you have to get these guys to talk.
My suggestions, 1. double bend I-beam frame, 2. all SS bolts, U-bolts etc., 3. two sets of bunks, 4. if you go brakes go with Kodiak, if they only sell Tie-Down run Forrest run!!
I'm on my third trailer and my nephew just had one built from Peterson Trailers (too far for you) however he only builds top of the line, no springs, only SS bolts, steel belted tires, LED lights, etc. don't let these Miami trailer guys pull crap on you with add ons!!! For example Ameritrail Trailers, way, way, overpriced but they do a lot of advertising and what I don't like, they use Tie-Down products.
Good luck!!