Did it say if those weights were bare hull, or dry finished hull weights, excluding motor & ancillary equipment BBG? It seems they are lighter than I remember them to be... not that my memory has been too good of late at times . Then again, even some of today's boatbuilders still find it hard to get their boat weights accurate!
I like Scotty's idea; borrow your mates trailer and grab your boat and go weigh it. Then weigh the empty trailer before giving it back (don't trust the weight stamped on the plate). That's the only way to be 100% sure (and be legal).
Cheers
Brendon