how much does a 22-23 ft boat weigh?

[crofty1984]

Also, I was considering buying a piece of string, how long do you think that might be?

Seriously though, I'm thinking of buying a boat. Something like a 20ft Norman or a 22-23ft Freeman. I've been boating all my life with my parents and now I live in the Norfolk broads it'd be nice to get my own but was considering one I could trailer.
So there's my question.
22ft fibreglass hull, 2-4 berth boat. How much do you think it would weigh? And I mean actually physically weigh, not the max. displacement of the hull.

If it had an outboard, maybe I could take it off if it made any diference.

Thanks, Dan