I'd like to point out to the conspiracists,
The dunnage is not there as a load restraint system. It's there to prevent the vehicle impacting the working floor when it compresses on its suspension during landing or in flight turbulence.
Lack of chains on heavy vehicles? Not going.
Having said that, I watched an il76 get airborne out of Kabul the other week and the only load restraint apparently was the vehicle handbrake...