As of March 2015, eBay's list of prohibited and restricted items does not ban the sale or purchase of any make or model of dump truck, including Kenworth dump trucks. Local and federal laws determine the list.
The website currently has a specific category where sellers can list used dump trucks. Alternately, sellers can place listings for new or used dump trucks on eBay Motors to sell vehicles locally or nationally. Sellers must register before they can list items on eBay; there is a fee to list each item. EBay also collects a percentage based on the buyer's final purchase price of a vehicle.