Loading And Unloading A Flatbed Trailer Move control valve (2) to the “Open” position to allow the trailer to tilt to the load/unload position. Deck Control Valve Load the cargo onto the trailer with approximately 60% of the cargo on the front half of the deck. As the cargo is moved forward on the deck, the deck will pivot down into the driving position. Pull latch up and secure safety pin (1) to lock the deck in the travel position. 123 Deck Latches Move the control valve to the “Closed” position and engage lock on valve handle. Control valve MUST be in the “Closed” position for towing trailer.
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