Rico:

I just checked my boat - the hull weights are there!

Stbd - 70
Port - 69

I had never noticed them before.

/please disregard my first post re: weights in the 80's

nova:
The best system is a 4 point hoist attached to a load cell. You roll your boat (mast down, but laid across the tramp - all other parts either attached or on the tramp) under the hoist, the boat is lifted, and the load cell outputs to a digital display. This method is accurate to +/- 1 or 2 lbs. if the cell is calibrated first.

A less accurate way is to use 2 bathroom scales, one under each hull. This has to be done on a hard, level surface and it's better if the scales are on pieces of plywood. This method is accurate to +/- 4 or 5 lbs. if the scales are of decent quality and are calibrated first (use barbell weights - 160 lbs on each)