I just bought an '87, which had been sitting for a long while, I'll share my experience so far.

I was told the boat was "ready to sail" and it included just about everything - harnesses and PFDs in addition to the trailer. Ready to sail was purported to mean, go to the beach, step up the mast, and sail away.

It was rigged, but everything was algae stained and rotted, cleats frozen up, etc. So I spent a good bit of time re-rigging, plus new trailer lights. When all was said and done, probably another $400 in addition to the boat.

The hulls are quite solid, but I made the mistake of not checking the bottoms of both hulls. Very strangely, one is heavily worn from what seems like repeated beach landings, while the gelcoat isn't even scratched on the other. I'm not sure how the PO managed that.

I paid $2500 for mine, which, in retrospect, was probably a little on the high side. I have seen several since which are going for ~$1500, which, if they are in the advertised condition, are much better deals. Unfortunately, I travelled a few states away to buy mine, and for various reasons didn't have the time or daylight to inspect as well as I should have.

I agree with the comments about righting the boat - I had a P-16 many years ago, and was able to right it by myself. There is no way I can do that with the P-18, and I'm getting ready to rig a pole and purchase a bag.