Re: Towing and trailer questions.
The displacement weight is the dry weight of the boat, so it ignored the weight of the motor (if an outboard), ice chests, ect...
I would look a round for a used sailboat trailer, but they can be somewhat rare. If you can't find one you can easily take any heavy duty trailer, or powerboat trailer and modify it with uprights for a sailboat. Assuming you are a decent welder it takes a long day to get it done, and I would advise looking at a few sailboat trailers for ideas on how to build it.
Your boat isn't that heavy, so no need to go crazy with structures, just some steel tubes, threaded rod, and large winds nuts works fine.