Instructions
Drive to the Pay and Spray in the northeast end of Staunton Island. Visit the nearby military base and search for the flatbed truck, which is usually parked inside the gates by a guard building.
Search the area surrounding the ocean docks on Portland Island. Constantly drive in a square loop on the main roads, and a flatbed truck usually appears after a few minutes. If it does not, park and wait for a few minutes, then continue to drive in a square loop.
Drive back and forth on the dam at the east end of Shoreside Vale. Occasionally a flatbed truck will appear on this dam, usually during the daytime. Check the airport in Shoreside Vale, to the left of the main road after crossing the bridge connecting Shoreside Vale with Staunton Island.