Retainer straps must fit tightly against which part of the trailer?

• A. The last full wall
• B. An adjacent wall
• C. The floor
• D. The ceiling

Answer: (A)

When securing cargo, the strap’s job is to transfer the load’s forces to a solid, immovable surface. The last full wall provides a continuous, sturdy barrier that can reliably bear the tension of the strap without flexing or bending. Placing the retainer strap tightly against that wall helps prevent any forward or backward movement of the load during transit and keeps the strap from slipping or loosening. Using an adjacent wall, the floor, or the ceiling isn’t as effective because those surfaces may be less solid, could allow shifting, or aren’t designed to be anchors for restraint systems. So, the best attachment point for a tight, effective restraint is the last full wall.