Ed,
Having driven double bottom gravel trains during the sixties (11 axles with semi and pup). I can attest to the difference in braking performance between loads and and empty.s. Loads seemed to be easier to stop due to better traction between the tires and the load.and empties. Three hundred foot skid marks suggest the truck was empty. and going too fast.
It will be very interesting to read the NTSB's final report.
Norm
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