Lone_Ranger,
I will comment since the picture obviously is not from the ill stricken airplane.
I am a belt and braces guy when it comes to securing cargo, what with a maritime past and working with lifts in the offshore oil & gas industry at present.
Back to the picture, I would have used wood of uniform dimension and secured them as blocks with either bolts through them or steel straps around them. I do not know what the trucks look like underneath, but my gut feeling is that I would have placed the wooden blocks longitudinally to provide more stability and if possible some transverse for good measure.
I can see that my approach is time consuming and might not be feasible in the constraints of an aircraft, but since you asked.
Thankfully I was not there and did not have to make the decisions.