We rebuilt our very scary trailer. I have no idea who built it originally. Of course, being connected to fabrication via oilfield, we are lucky in that we can send things to our friends and get them sandblasted and painted.

But, we still had to get new axles and other parts. The only thing saved was the A-frame, which is prolly the same as any other large powerboat trailer. You could find a big powerboat trailer and see if you can work with that.

We get our parts from Champion Trailer, which is in Slidell LA (near NOLA). That, and we made decking and fender guards out of plywood.

There's a trailer fabrication house south of Houston, in Santa Fe TX. http://www.sportsmantrailers.com/

They make a nice trailer. I have a cat trailer made by them, and when we lived in TX I had them do some work on another trailer. See what they have to say, might be worth it to you.