It says make an offer, or willing to trade for a running diesel he can use for a bio project, or trade for a small sailboat he can fix up and play with.
:EDIT: Went back to re-read, here is the quote:
" I would consider a sale (make me an offer. FYI, the parts alone are worth a few thousand dollars) but would prefer a trade for pretty much any vehicle in reliable, running condition; preferably a diesel, as I would still like to do a veg conversion project somewhere down the line. Send along a proposed trade and I will most definitely consider it. If it runs, I'm interested. I would also consider a trade for a small sailboat or sailing vessel of some sort. "