When my trailer got stolen about 4 years ago, I found some dealers down on the west coast of Florida. They had some trailers and were out of stock on some I was interested in. I looked at the name on them and tracked the manufacturer (SE Metals) to Lake City, Florida. I drove up that same day and told them about my problem. They generally sell to other trailer sales places, but the do sell to the public as well. They had my trailer done in 2 days ready to pick up.
The trailer is 16' x 77"(I believe). The base price was $1050. It came with new wheels and police car take-off tires. It has a removable drop gate and I added an elevated 18"x18"x77" cage to the front for another $150. I would not hesitate to buy from them again. As a matter of fact, I should sell this one locally and get a new one
Used trailers go for good money around here
They have a website, it looks as if they just updated it, so some it's not fully functional. http://www.southeasternoutlet.com/