Find the location of nearby diesel pickup trucks for sale by using the seller location search options on sites such as eBay.com, CarGurus.com, DieselSellerz.com and CarsForSale.com. Craigslist doesn't have a dealer location filter, but instead it maintains different subsections of its site based on major cities and regions.
To locate eBay sellers in your area with current listings for diesel trucks you need to enter in a ZIP Code and search radius into the search filters section on the left side of the results page, as of March 2015. This limits all results to only those within the specific area, with each listing displaying the number of miles the seller is from the designated ZIP Code. It is important to note that many sellers on eBay are open to remote purchases, so you can comfortably expand your search on the site without risk of losing a sale because it's too far away.
Finding nearby diesel truck sellers on Craigslist involves going to your city's main Craigslist page. You can find the best Craigslist page for you by going to the main Craigslist site and first choosing your state. This leads to a listing of all major Craigslist pages within that state, thus allowing you to choose the most local option.