If you're looking for a pre-1956 truck, especially from 1931 to 1934, the best way to start is by checking local listings and talking to collectors. Trucks from that time can be hard to find, but they do show up.
Look on an online marketplace that lets sellers post clear photos and details. Some sites also let you message sellers and watch live walkarounds, which helps when checking body condition. You can search by year and location to save time.
It’s also good to check local classic car clubs, swap meets, and auctions. Some owners may not list online but might sell if they know someone is interested.