Don't have time to read the whole post but here is my two cents. Learned this during my Navy service with break bulk shipping loading and managing over the road truck hauling.
The key goal is to tie loads down, so they become integral with the platform. Especially heavy loads, (more critical as weight increases) the slightest movement of the load will start to create slack especially with flexible ties. That movement keeps getting worse and soon the inertia exceeds the strength of the tie down system. Simple high school science.
Mobile equipment loads with we always used high strength cables and turnbuckles to tie down in ship holds. There is nothing worse than moving cargo.
Chains and ratchet binders were mandatory for truck and trailer loads. We found lever type binders were just not capable of reducing slack. Each load type has to be analyzed as to the best system. All tie down systems have to be checked periodically to ensure load integrity with its platform. Takes regular inspections and possible retightening.
Rough roads can also cause slack in tie downs. Nothing is perfect in this endeavor. Get sloppy and your insurance company will not like you. Remember Murphy's law "if it can, it will".
If you travel much, you have probably seen trucks parked with part of their load scattered behind them and a gaping hole in the side of the van type box. Loose cargo moving around.
Blocking and bracing of cargo in sea vans and break-bulk shipping becomes very critical with the goal of cargo becoming solid with the ships deck and hull.
Professional truckers are well trained in these principles. The driver is always responsible for securing the load, never trust others.
Be safe for yourself and those around you, Ron
