Trucks transporting cars

I saw one of those large tractor trailer rigs on 15-501 yesterday, carrying what appeared to be 6 Hondas. 5 of them were on the upper level and only one was on the lower level. The company says that this is perfectly safe. I find it hard to believe. With all of that weight up top and so much less down below, how can it not be unstable.

The NC Highway Patrol is to call me back to explain. 919-715-8683 - Motor Carrier Division. LT SHACKLEFORD (my apologies for misspelling his name).

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The LT called me back. Said that this is all regulated at the federal level and suggested contacting the FMCSA and the NHTSA plus the NHTSB.