When you're carrying other vehicles piggyback, you should use restraints and the parking brake on each vehicle. What else should you do?

• A. Make sure the vehicles are sheeted
• B. Rope the vehicles together
• C. Put the heavy vehicles at the top
• D. Place chocks under the wheels

Answer: (D)

Wheel chocks stop wheels from moving and are essential when piggybacking vehicles. Even with restraints and a parking brake, a vehicle can still roll if the ground is slippery, on a slope, or if a brake or restraint shifts during movement. Placing chocks under the wheels on both sides of each vehicle prevents any wheel from turning, adding a solid physical barrier to movement. Fit the chocks before moving and leave them in place until the load is safely secured and stationary. Other options don’t address movement in the same reliable way: sheeting covers the load, not its stability; tying the vehicles together isn’t a safe or standard method; and placing heavier vehicles at a particular position doesn’t inherently prevent rolling.