I’m going with the front left tire suddenly losing air. That truck easily weighs over 90K pounds, add in momentum of the outside curve, the shifting liquid weight and at 60MPH, all the driver can do is hold on and try to lessen the impact when that happens. Slamming on the brakes won't do anything except flip the trailer and cab. I think he tried to put it on the wall and let friction slow it down.
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