Good luck with the new trailer.
It looks like the same thing I have.
Surge brakes on it? That's what I have. I hall my boat about 50 miles to the ocean every weekend, with out any problems.
Now swaying or anything. Hardly know it's there, Untill you take out a few parked cars
I can relate to bad service, I bought my boat from a place I can not stand! Very poor service! Live and learn!