A couple of things, 1. check out the Conteintal site ONLY to notice how the tounge is assembled on the top and bottom trailers on the home page. I only believe in the trailers where the I-beams are "molded" around the 3"x3" steel tubing where the hitch assembly is. The bottom picture is the better and more expensive method.
http://www.continentaltrailers.com/ 2. spend the extra $$$ on the all stainless bolts, u-bolts, etc, option. Well worth it 3. no matter what you spend the springs will rust and need replaced....just a fact of life and the lights will quit working just as the cops are behind you.