Have you looked at www.vnosetrailers.com? They look like they are close to you. I spoke with them on my way home from Albany last month, they seem to be accommodating to changes and upgrades. They use 2 different manufacturers in Georgia, one is definitely built better than the other. I haul from Long Island out to Indiana every summer for a bike show, and my last trailer I had built with a 5 1/2’ interior height. Low Haulers like this cut through the air better, as they are close to the same height as pickup trucks.
Whatever you do, do not use Kristi Trailer in Canastota, NY! While they built a really nice trailer, they have basically shut down operations, but are still taking deposits. I, along with several others, are in the middle of legal action against them to have our deposit returned.