If I had it all to do over again, I'd buy a hinge from Grant Whipp for two reasons:
1) He'll talk trailers with you and give you great advice.
2) He's a helluva nice guy.
3) His Better-Than-Hurricane hinge is fantastic
4) See reason #2.
Here's a link to his site
http://www.lilbear.teardrops.net/parts.html
No, I don't get a commission on sales.
We bought one of his hinges and never had an ounce of trouble with it. All of our trailers in the future will have his hinge on it.