Having said this, how do I determine how much it weighs, from
limited information, without being there to weigh it?

You can't. The dimensions (alone) of the boat don't dictate the weight. It's a
wooden hull......ok, how thick? Low deadrise or deep V? 1000 pounds of gear
aboard, or not? Way too many variables.

Figure that with the trailer it will be at least as heavy as the "displacement"
number plus the curb weight of the empty trailer. At least.