Loading And Unloading A Dump Trailer 107 Close and latch rear doors before moving the trailer. Pull up on lever (1) to lock top hinged gate or close gate latch (2). Install safety lock pin on both styles of gates. Lock Top Hinged Gate Close Latch On Double Swing Gates ! WARNING Unsecured gate(s) can cause a driving hazard. Do not operate trailer without properly securing rear latch.
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