Well I was never a flatbed driver so I can not relate to chaining loads. However I drove a city route with a 48 foot van,and had load bars as well as recessed rings on the walls that I strapped a lot of tall skids to the sides,to keep them from tipping over in transit. Yes it is very wise to make sure you secure your freight regardless of the commodity. There is an error I see this flatbed driver did make above and beyond securing this coil. Was mashing his brakes in a curve,or rounding a corner can add much more strain on straps,and I'm sire chains as well,that could cause the straps to stretch,and chains to snap. Just riding down the road with normal bouncing over pot holes can also put a strain on an restraints you may have holding your load. But climbing on the brakes can be the worst movement there is,in my opinion given my 45 year trucking experience.