I'd recommend Craigslist before eBay. eBay has raised listing fees and such a lot in the past couple years and in general made it more expensive and more hassle to use them. But that being said, make a complete and detailed description. Disclose any problems. The more pictures the better, and make sure the quality is good enough that someone can either see any flaws or see that none are present. People are more inclined to bid on no reserve auctions since they know they're not wasting their time. Make sure pictures are of different areas and angles. If the vehicle is more than a few years old be sure to include pictures underneath of the frame and floor pans, or any areas than are prone to rust (pickup bedsides/wheel wells, car frame rails, etc.).
Make sure you list it so it will end at a time when most people will be home or otherwise available. If it ends during work hours they may get ties up with work and not have time to bid at the end, or during morning or evening commute would exclude people. When I used to sell things on eBay I'd end them after dinner on weeknights or or weekends. Most people try to "snipe" items at the end of the auction. I don't get it. I'm exactly the opposite, I put my max bid when I see it and forget about it until the auction is over.