Welcome! As others have suggested it helps a lot to make a decision on what size you can or can't live with and the layout you may want by actually sitting in one. Attend a Fiberglass Trailer meet near you if you can.
When I first started looking I was sure I would be real happy with a 13' without a bathroom. After actually sitting in one I quickly realized that while it would work I might not be overly happy with it over the long run.
A great thread if you haven't already stumbled on it that gives you some ideas as to what the various sizes and models of fiberglass trailers weigh loaded up for camping is called Trailer Weights in the Real World
. As you will see from looking at actual weights that trailer manufactures dry weights can be a little misleading.....