This is awesome! Good to see someone take a risk to try something different with STEEM!
I wish you luck with your sale.
Have you considered posting on Craigslist and also cross linking to this STEEM post? Would be interesting to see how many new hits get generated from Craigslist.
Another suggestion, if you have some wiggle room in the price, is to discount the car for anyone willing to pay with STEEM from the Craigslist posting??? Like $7,000 USD worth of Steem.
Just shooting off some ideas :)