What control measures could be considered to reduce the risk factors listed in supporting document $4?$ As the lifting operation to unload the stacks of chairs from the flatbed truck was assessed using the HSE's MAC assessment tool in Document $4$

Weather is bright and sunny, Its $0830$am on day of the wedding event day. Workers X & Y arrive early as their boss wants Marquee set up early. Remaining workers start at $0930.$am The boss asks Workers X & Y to start unloading the flatbed truck that is filled with chairs and to carry them inside to the marquee. Worker X will unload the stacks of SIX chairs from the truck $,$ and worker Y will carry each stack of chairs into the marquee.

Worker X first release the drop down side of the truck closest to the marquee There is only just enough space to drop the side of the truck down as it is parked so close to the marquee. Worker X stands as close to the truck as they can and reaches as far as they can to get hold of the first stack of six chairs. The flatbed of the truck is level with their chest. They grab hold of the stack by the back legs of the bottom chair. The stack is a bit unstable but worker X continues with this unloading task, gradually working their way along the length of of the flatbed truck towards its cab. By $0930$ the rest of the team arrives, the chairs are then all unloaded into the marquee.