If you don't receive compensation for conducting the sale, you aren't required to be licensed as an auctioneer.
If you personally own the goods and you didn't get them for the purpose of reselling them, you don't need an auctioneer license.
A licensed auctioneer can call bids for cars and other motor vehicles. The paperwork for releasing the title to the vehicle must be completed by someone with a dealer's license.
See ATF Rul 96-2: Activities of Auctioneers Requiring a Dealer's License in the Federal Firearms Regulations Reference Guide.
A licensed auctioneer can call bids for real estate. However, you or an associate must be licensed to perform the activities regulated under Washington Real Estate Licensing Law, including earnest money, contracts, and marketing.